Conference Agenda

Topical Meetings and Sessions:

TOM 1 - Silicon Photonics and Guided-Wave Optics
TOM 2 - Computational, Adaptive and Freeform Optics
TOM 3 - Optical System Design, Tolerancing and Manufacturing
TOM 4 - Bio-Medical Optics
TOM 5 - Resonant Nanophotonics
TOM 6 - Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and applications
TOM 7 - Thermal radiation and energy management
TOM 8 - Non-linear and Quantum Optics
TOM 9 - Opto-electronic Nanotechnologies and Complex Systems
TOM 10 - Frontiers in Optical Metrology
TOM 11 - Tapered optical fibers, from fundamental to applications
TOM 12 - Optofluidics
TOM 13 - Advances and Applications of Optics and Photonics
EU Project Session
Early Stage Researcher Session

More information on the Topical Meetings

Select a date or location to show only sessions at that day or location. Select a single session for a detailed view (with abstracts and downloads when you are logged in as a registered attendee). The rest of the TOM sessions, EU project session, tutorials, and Early Stage Researcher session will be updated soon. Thank you for your patience!

Session Overview
Date: Wednesday, 14/Sept/2022
9:00am - 10:30amTOM1 S02: Silicon Photonics and Guided-Wave Optics
Location: B116
Session Chair: Graham Trevor Reed, University of Southampton, United Kingdom
9:00am - 9:30am
ID: 378 / TOM1 S02: 1
TOM 1 Silicon Photonics and Guided-Wave Optics

Ge/SiGe quantum wells for mid infrared integrated photonics

Jacopo Frigerio

Politecnico di Milano, Polo Territoriale di Como - L-NESS Lab, Italy

Ge/SiGe quantum wells for mid infrared integrated photonics

9:30am - 9:45am
ID: 301 / TOM1 S02: 2
TOM 1 Silicon Photonics and Guided-Wave Optics

Hybrid integration methodology for quantum cascade lasers with germanium waveguides in mid-IR

Colin James Mitchell1, Ahmed Osman1, Ke Li1, Jordi S. Penadés1, Milos Nedeljković1, Longqi Zhou2, Kristian M. Groom2, Jon Heffernan2, Goran Mashanovich1

1University of Southampton, United Kingdom; 2University of Sheffield, United Kingdom

Mid-infrared quantum cascade lasers (QCLs) operating around 5.7 µm have been integrated with germanium waveguides on silicon substrates. QCL bars have been designed and fabricated at the University of Sheffield for the purpose of integration. This hybrid approach uses flip-chip technology that has been successfully transferred from a silicon-on-oxide (SOI) platform working at communication wavelengths, demonstrating the flexibility of this approach. Integration challenges are introduced, and solutions discussed, leading to the next iteration of design presented here.

9:45am - 10:15am
ID: 381 / TOM1 S02: 3
TOM 1 Silicon Photonics and Guided-Wave Optics

Visible single-photon avalanche detectors

Thomas Ang

A*STAR, Singapore

Visible Single-Photon Avalanche Detectors

10:15am - 10:30am
ID: 334 / TOM1 S02: 4
TOM 1 Silicon Photonics and Guided-Wave Optics

Polarization independent 2×2 multimode interference coupler with bricked subwavelength metamaterial

Carlos Pérez-Armenta1, Alejandro Ortega-Moñux1, José Manuel Luque-González1, Robert Halir1,2, Pedro J. Reyes-Iglesias1, Jens H. Schmid3, Pavel Cheben3, Íñigo Molina-Fernández1,2, J. Gonzalo Wangüemert-Pérez1,2

1Telecommunication Research Institute (TELMA) Universidad de Málaga, CEI Andalucía TECH, Louis Pasteur 35, 29010 Málaga; 2Bionand Center for Nanomedicine and Biotechnology, Parque Tecnológico de Andalucía, Málaga 29590, Spain; 3National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada

The silicon-on-insulator (SOI) platform enables high integration density in photonic integrated circuits while maintaining compatibility with CMOS fabrication processes. Nevertheless, its inherently high modal birefringence hinders the development of polarization-insensitive devices. The dispersion and anisotropy engineering leveraging subwavelength grating (SWG) metamaterials makes possible the development of polarization agnostic waveguide components. In this work we build upon the bricked SWG metamaterial nanostructures to design a polarization independent 2×2 multimode interference (MMI) coupler for the 220 nm SOI platform, operating in the telecom O-band. The designed device exhibits a 160 nm bandwidth with excess loss, polarization dependent loss and imbalance below 1 dB and phase error lower than 5°.

9:00am - 10:30amTOM13 S04: Advances and Applications of Optics and Photonics
Location: B035
Session Chair: M.Teresa Flores-Arias, Universidade de Santiago de Compostela, Spain
9:00am - 9:30am
ID: 322 / TOM13 S04: 1
TOM 13 Advances and Applications of Optics and Photonics

Advancing fluorescence microscopy and spectroscopy for the benefit of cell science and drug delivery

Ana I. Gómez-Varela1, Adelaide Miranda2, Dimitar Stamov3, Ricardo Gaspar2, Bruno Silva2, Pieter de Beule2

1Universidade de Santiago de Compostela, Spain; 2International Iberian Nanotechnology Laboratory; 3JPK BioAFM, Bruker Nano GmbH

Here we report on two recent advances we made applying advanced fluorescence microscopy and spectroscopy to advance the study of cell biology and drug delivery. At first, we detail a new instrumental set-up combining atomic force microscopy in liquid and super-resolution fluorescence microscopy in novel configuration such that long-term simultaneous and co-localized observation with both techniques becomes feasible. We believe this will contribute to the study of fast membrane activated cell-signalling processes in the years to come. Furthermore, we report on a novel application of Fluorescence Cross-Correlation spectroscopy (FCCS) for the characterization of lipid-nucleic acid complexes. We are able to determine the number of nucleic acid particles incorporated in each liposome, a parameter not readily accessible an ensemble basis with any other technique known. This parameter is crucial for co-delivery applications and we believe FCCS can play an important role in the future development of new drug delivery systems.

9:30am - 9:45am
ID: 253 / TOM13 S04: 2
TOM 13 Advances and Applications of Optics and Photonics

Micro-diffractive optical element arrays for beam shaping

Shima Gharbi Ghebjagh, Thomas Handte, Stefan Sinzinger

Technische Universität Ilmenau, Germany

We describe the design of Fourier type array generators and beam shapers as periodic configurations of refractive-diffractive optical elements in microscale to provide specific beam shaping and imaging functionalities. We investigate how the addition of micro-nanostructures to regular microstructure arrays enables new degrees of freedom for the design of micro-optical systems, in combination with adapted fabrication techniques yields a better optical performance and leads to enhancement of the array concept, uniformity and efficiency.

9:45am - 10:00am
ID: 270 / TOM13 S04: 3
TOM 13 Advances and Applications of Optics and Photonics

Experimental evaluation of Fourier transform holograms by a self-interferometric technique

Esther Nabadda1, Pascuala Garcia-Martinez2, María M. Sánchez-Lopez1, Ignacio Moreno1

1Universidad Miguel Hernandez, Spain; 2Universitat de València

We present a technique that combines an encoding method to display complex-valued holograms onto a phase-only spatial light modulator (SLM) with a phase-shifting interferometric (PSI) technique for experimentally evaluating the generated complex-valued optical fields. We demonstrate an efficient common-path polarization interferometer based on the SLM itself, not requiring any external additional element. The same setup can be used to simultaneously display the complex hologram and to apply the phase-shifting values required to retrieve the phase distribution of the optical field. A simple rotation of a polarizer allows to change from the intensity configuration to the interferometer configuration.

10:00am - 10:15am
ID: 298 / TOM13 S04: 4
TOM 13 Advances and Applications of Optics and Photonics

Measurement of ultrafast carrier dynamics in multilayer MPCVD graphene

Tânia M. Ribeiro1, Tiago E. C. Magalhães1, Bohdan Kulyk2, Alexandre F. Carvalho2, António J. S. Fernandes2, Florinda M. Costa2, Helder Crespo1

1Instituto de Física de Materiais Avançados, Nanotecnologia e Fotónica (IFIMUP), Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal; 2I3N, Departamento de Física, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal

Graphene presents unique opto-electronic properties which makes it useful for a wide range of applications and devices, such as high-speed photodetectors, that rely on the relaxation dynamics of photoexcited charge carriers. These demand reliable and reproducible methods for synthesis of high quality graphene. Here we present ultrafast degenerate pump-probe measurements of multilayer graphene coatings grown by microwave plasma chemical vapour deposition (MPCVD) and analyse the impact of the synthesis growth time on the material’s nonequilibrium optical response.

9:00am - 10:30amTOM3 S04: Optical System Design, Tolerancing and Manufacturing
Location: B032
Session Chair: Marco Hanft, Carl Zeiss AG, Germany
9:00am - 9:30am
ID: 335 / TOM3 S04: 1
TOM 3 Optical System Design, Tolerancing and Manufacturing

Zoom lens first-order search tools: Monte Carlo vs particle swarm optimization

Julie Bentley, Jacob Sacks

University of Rochester

It is often easier (and faster) for a lens designer to adapt an existing design or known design form to a new problem. Very rarely do you need to go back to first-order thin lenses and/or invent a new form. However, the design of a new zoom lens is complex and typically requires a designer to “start from scratch”. Monte-Carlo (MC) searches have proven to be an effective way to characterize the first order solution space of zoom lenses, but MC simulations can take many hours/days to be completed, slowing down the design process. Particle swarm optimization (PSO) is an alternative optimization algorithm that mimics the hunting or foraging behaviors of a group of organisms. This paper compares the sets of solutions generated by MC and PSO methods, showing that PSO is capable of generating a diverse set of solutions that typically outperform the solutions generated by MC in a fraction of the time.

9:30am - 9:45am
ID: 185 / TOM3 S04: 2
TOM 3 Optical System Design, Tolerancing and Manufacturing

Ray transfer matrix for onion-type GRIN lenses

Veronica Lockett1, Rafael Navarro1, Jose Luis López2

1INMA, Consejo Superior de Investigaciones Científicas, Universidad de Zaragoza, Zaragoza, Spain; 2Universidad Pública de Navarra, Pamplona, Spain

We present the computation of an ABCD matrix for onion-type GRIN lenses. By applying a differential approximation of the layer thickness, the matrix product of a high number of matrices is synthetized into a single matrix where the elements are integrals. The difference between this ABCD matrix and a homogeneous lens matrix is one integration term in element C, which is the GRIN contribution to the lens power. In the case of the crystalline lens, the analytical approximation to the GRIN lens power provides an accurate and concise solution in terms of Gaussian hypergeometric functions.

9:45am - 10:00am
ID: 208 / TOM3 S04: 3
TOM 3 Optical System Design, Tolerancing and Manufacturing

Enabling photonic system integration by applying glass based microelectronic packaging approaches

Henning Schröder1, Wojciech Lewoczko-Adamczyk1, Daniel Weber2

1Fraunhofer IZM, Germany; 2Technische Universität Berlin

Advanced hybrid packaging technologies are used to enhance functionality of glass-based substrates featuring electrical, thermal and optical components including laser diodes, modulators, isolators, photonic integrated circuits, beam-splitters and micro lenses. Such glass-based substrates can be either thin glass layers on large panels containing optical waveguides or more mini-bench-like boards. Optical fiber interconnects, plugs, and electrical-optical integration platforms are used for higher level system integration. We discuss thin glass as a suitable base material for ion exchanged waveguide panels and interposers, precise glass structuring for posts and holders, electrical wiring and the related high precision assembly techniques.

10:00am - 10:15am
ID: 212 / TOM3 S04: 4
TOM 3 Optical System Design, Tolerancing and Manufacturing

Control of thermal emission for thermophotovoltaic systems

Daniela De Luca1,2, Antonio Caldarelli2,3, Eliana Gaudino2,3, Umar Farooq1,2, Marilena Musto2,3, Emiliano Di Gennaro1,2, Roberto Russo2

1Department of Physics, Università degli Studi di Napoli “Federico II”, 80125 Napoli, Italy; 2Deparment of Industrial Engineering, Università degli Studi di Napoli “Federico II”, 80125 Napoli, Italy; 3Consiglio Nazionale delle Ricerche, Istituto di Scienze Applicate e Sistemi Intelligenti, 80131 Napoli, Italy

Thermal emitters play a key role in controlling the thermal radiation emitted in thermophotovoltaic systems and in increasing their energy conversion efficiency. Here, we present different designs of emitters with spectrally selective properties, based on easy-to-fabricate multilayer structures and characterized by a sharp transition from high to low emissivity in the region of interest. Those structures make use of refractory materials to allow working at high operating temperatures and they can be easily customized to maximize the thermal emission in the region of the desired wavelengths.

10:15am - 10:30am
ID: 282 / TOM3 S04: 5
TOM 3 Optical System Design, Tolerancing and Manufacturing

Removing microdefects on glass surfaces using laser radiation

Kerstin Götze1, Jens Bliedtner1, Jürgen Bischoff1, Oliver Faehnle2, Michael Kahl2

1University of Applied Sciences Jena, Germany; 2OST – Eastern Switzerland University of Applied Sciences

Scratches and microdefects on glass surfaces significantly impair the optical and mechanical properties of optical components. They already occur during mechanical processing (shaping) and have to be removed in several specific processing steps. A process is presented with which scratches and microdefects can be removed by means of CO2 laser radiation.

9:00am - 10:30amTOM4 S02: Bio-Medical Optics
Location: B325
9:00am - 9:30am
ID: 405 / TOM4 S02: 1
TOM 4 Bio-Medical Optics

“Random illumination microscopy (RIM) : some advances and biological applications”

Simon Labouesse1, Guillaume Giroussens2, Kevin Affannoukoue2, Claire Estibal1, Renaud Poincloux3, Loïc Le Goffe2, Marc Allain2, Jérome Idier4, Anne Sentenac2, Thomas Mangeat1

1LITC Core Facility, Centre de Biologie Integrative, Université de Toulouse, CNRS, UPS, 31062 Toulouse, France; 2Institut Fresnel, Aix Marseille Université, CNRS, Centrale Marseille, Marseille, France; 3Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, UPS, Toulouse, France; 4LS2N, CNRS UMR 6004, 1 rue de la Noë, F44321 Nantes Cedex 3, France

Current super-resolution microscopy (SRM) methods suffer from an intrinsic complexity that might curtail their routine use in cell biology. We describe here random illumination microscopy (RIM) for live-cell imaging at super-resolutions matching that of 3D structured illumination microscopy, in a robust fashion. Based on speckled illumination and variance matchning process called AlgoRIM [1-2-3], easy to implement and user-friendly, RIM is unaffected by optical aberrations on the excitation side, linear to brightness, and compatible with multicolor live-cell imaging over extended periods of time [1]. AlgoRIM is compatible with various RIM extensions which leads to use one single including TIRF RIM, RIM, mutliplane 3DRIM,exRIM. In the best case a resolution of 76nm is possible in TIRF RIM as well as around 120-140nm on 3D live sample until 100µm depth. The recent technological advances, allow to implement RIM on a basic microscope for a rate of 1300hz in two colors, and a lightened synchronization with the scmos detectors in comparison with the SIM technology.

[1] Mangeat, T., et al,Super-resolved live-cell imaging using Random Illumination Microscopy. Cell Reports Methods, 1(1), 100009.

[2] al,2020 28th European Signal Processing Conference (EUSIPCO) (pp. 785-789). IEEE.


9:30am - 10:00am
ID: 402 / TOM4 S02: 2
TOM 4 Bio-Medical Optics

Phase contrast imaging to detect transparent cells in the retinal ganglion cells layer

Elena Gofas Salas1,2, Nathaniel Norberg2, Céline Louapre3, Ysoline Beigneux3, Catherine Vignal-Clermont2,4, Michel Paques2, Kate Grieve1

1Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; 2CHNO des Quinze-Vingts, INSERM-DGOS CIC 1423, 28 rue de Charenton, F-75012 Paris, France; 3Sorbonne Université, Paris Brain Institute - ICM, Assistance Publique Hôpitaux de Paris, Inserm, CNRS, Hôpital de la Pitié Salpêtrière, CIC neurosciences, Paris, France; 4Hôpital Fondation Rothschild, Paris, France

The eye is an optical window giving access to neural networks in a non-invasive way. It is possible to find in the retina biomarkers informing about the pathological state of other parts of the human body, and in particular of the brain. Neurodegenerative diseases could thus be diagnosed early and monitored by high-resolution imaging of the retina. However, a large part of the neurons in the retina are too transparent to be detected by existing techniques. At the Quinze-Vingts hospital, we have a unique retinal imaging platform in which ophthalmologists, neurologists and engineers participate. We implemented a technique based on scanning laser ophthalmoscopy (SLO) to capture the fine variations in refractive index between retinal cells. In this project we aimed at imaging and monitor cellular changes on transparent cells in the retinal ganglion cells layer in vivo on healthy participants and patients with neurodegenerative diseases.

10:00am - 10:30am
ID: 398 / TOM4 S02: 3
TOM 4 Bio-Medical Optics

Wavefront shaping using acousto-optic deflectors allows fast 3D recording of neuronal activity and transcranial imaging

Laurent Bourdieu

CNRS, France

Optically recording unitary neuronal activity with millisecond temporal resolution, in 3D, at large depths and in the behaving animal, is a major challenge in neuroscience. Acousto- optic deflectors (AODs) are known to be fast 2D-scanning devices. We have recently shown that they can be also used a fast beam shaping devices by synchronizing the laser pulses of low-repetition rate laser (typically a 40 kHz regenerative amplifier) with the update of the acoustic pattern in the AODs. In this configuration, the wavefront of every single laser pulse is individually patterned in phase and amplitude. We implemented this technique in a 2 photon microscope to perform (i) fast 3D serial recording at kHz rate of selected individual targets and (ii) transcranial widefield 2D-imaging using aberration and scattering corrections.

9:00am - 10:30amTOM5 S01: Resonant Nanophotonics
Location: B120
Session Chair: Nicolas Bonod, CNRS, France
9:00am - 9:30am
ID: 372 / TOM5 S01: 1
TOM 5 Resonant Nanophotonics


Magnus Jonsson

Linköping University, Sweden


9:30am - 9:45am
ID: 140 / TOM5 S01: 2
TOM 5 Resonant Nanophotonics

Surface plasmon influenced Pancharatnam-Berry geometric phase in Young's arrangement

Aleksi Leinonen, Ari T. Friberg, Tommi K. Hakala

Institute of Photonics, University of Eastern Finland, Finland

We theoretically study how surface plasmons influence the Pancharatnam--Berry geometric phase of light in a metallic Young's two-slit arrangement by using a phenomenological model. The surface plasmon is found to influence the magnitude of the Pancharatnam--Berry geometric phase if the symmetry of the system is broken at geometry or polarization level. Additionally, nonidentical apertures and different surface plasmon propagation distances can have a major impact on the induced Pancharatnam--Berry phase.

9:45am - 10:00am
ID: 147 / TOM5 S01: 3
TOM 5 Resonant Nanophotonics

T-matrix based scattering analysis of photonic materials with periodicity in different dimensions

Dominik Beutel, Carsten Rockstuhl, Ivan Fernandez-Corbaton

Karlsruhe Institute of Technology, Germany

Optical devices and artificial photonic materials frequently make use of periodic arrangements of identical scatterers in 3D, 2D, and 1D, e.g. photonic crystals, meta-surfaces, or particle chains. To simplify their analysis, we present here a computational framework based on the T-matrix method that explicitly exploits spherical, cylindrical, and plane waves depending on the geometry and number of dimensions of the lattice. Due to the analytic properties of the chosen basis sets in combination with the use of Ewald's method for the lattice summation, we obtain an efficient framework to simulate such systems. The applicability will be illustrated at the conference by means of selected examples of contemporary interest.

10:00am - 10:15am
ID: 228 / TOM5 S01: 4
TOM 5 Resonant Nanophotonics

Switchable optics based on guided mode resonance in lithographically patterned vanadium dioxide

Markus Walther, Thomas Siefke, Kristin Gerold, Uwe D. Zeitner

Friedrich Schiller University Jena, Institute of Applied Physics, 07745 Jena, Germany

Vanadium dioxide as a phase change material is usually known for its consideration in smart window applications. However, the attention shifts to using it in actively switched optical elements. The main challenges are the deposition of vanadium dioxide with the correct stoichiometry and phase and the patterning of the material. We propose a design with a corresponding manufacturing process for an actively switchable reflector at 1550 nm wavelength with a contrast near 10^5 by using the thermochromic effect of vanadium dioxide. The reflectance of the proposed optical element can be controlled between an ultra-low and a high reflecting state. We elaborate on the proposed optical design, the manufacturing process including deposition, annealing and patterning processes, and discuss already achieved results.

10:15am - 10:30am
ID: 246 / TOM5 S01: 5
TOM 5 Resonant Nanophotonics

Tailoring magnetic dipole emission by broken-symmetry TiO2 metasurfaces

Ayesheh Bashiri, Aleksandr Vaskin, Katsuya Tanaka, Thomas Pertsch, Isabelle Staude

Friedrich Schiller University Jena, Germany

Strong magnetic dipole emission is offered by rare earth ions such as trivalent lanthanides, due to selection rule forbidden electric dipole (ED) transitions. This stimulates the study of optical nanostructures, which efficiently tailor magnetic dipole emission. High refractive index all dielectric nanostructures are promising candidates in this regard due to their strong magnetic response and negligible absorption loss in the visible spectral range. Here, we design and experimentally realize a broken-symmetry titanium dioxide (TiO2) metasurface supporting an out-of-plane magnetic dipole (MD) resonance at 590 nm wavelength, corresponding to the MD transition of trivalent Europium ions (Eu3+). A strong photoluminescence (PL) enhancement of the MD transition up to a factor of 15.5 is observed.

9:00am - 10:30amTOM8 S01: Nonlinear and Quantum Optics 1
Location: B328
Session Chair: Said Rodriguez, AMOLF, Netherlands, The
9:00am - 9:30am
ID: 361 / TOM8 S01: 1
TOM 8 Non-linear and Quantum Optics

Engineering localised modes via drive and dissipation in photonic lattices

Alberto Amo

Laboratoire de Physique des Lasers, Atomes et Molécules, University of Lille - CNRS, France

The engineering of localised modes in photonic structures is one of the main targets of modern photonics. An efficient strategy to design these modes is to use the interplay of constructive and destructive interference in periodic photonic lattices. This mechanism is at the origin of defect modes in photonic bandgaps, bound states in the continuum and compact localised states in flat bands. In this presentation we show that in lattices of lossy resonators, the addition of external optical drives with controlled phase enlarges the possibilities of manipulating interference effects and allows designing novel types of localised modes [1]. We show that light can be localised down to a single site of a photonic lattice in a fully reconfigurable manner. We use the technique to engineer dissipative solitons in topological gaps [2]

9:30am - 9:45am
ID: 119 / TOM8 S01: 2
TOM 8 Non-linear and Quantum Optics

Pulse self-compression down to the sub-cycle regime in hollow capillary fibers with decreasing pressure gradients

Marina Fernández Galán, Enrique Conejero Jarque, Julio San Roman

Universidad de Salamanca, Spain

We theoretically demonstrate an enhancement in the generation of clean, near-infrared sub-cycle laser pulses by soliton self-compression in gas-filled hollow capillary fibers using decreasing pressure gradients. Furthermore, we identify the optimal input parameters for high quality compression and the main advantages of this promising technique which paves the way towards ultrafast vacuum experiments.

9:45am - 10:00am
ID: 169 / TOM8 S01: 3
TOM 8 Non-linear and Quantum Optics

Supercontinuum generation in the enhanced frequency chirp regime in multipass cells

Victor W. Segundo Staels1, Enrique Conejero Jarque1, Daniel Carlson2, Michaël Hemmer2, Henry C. Kapteyn2, Margaret M. Murnane2, Julio San Roman1

1Aplicaciones del Láser y Fotónica, Universidad de Salamanca, Salamanca, Spain; 2JILA and STROBE NSF Science & Technology Center, University of Colorado and NIST, Boulder, Colorado, United States

We identify, via numerical simulations, the regime of enhanced frequency chirp during nonlinear propagation in multipass cell. This regime - used before the dawn of chirped pulse amplification to generate ultrashort pulses - paves the way for the generation of temporally clean fewcycle pulses. Here, we demonstrate numerically that the spectra of pulses from an Yb-based laser system can be broadened into a flat supercontinuum with a smooth spectral phase compatible with a clean few-cycle pulse with temporal secondary structures with peak intensity below 0.5% that of the main peak.

10:00am - 10:30am
ID: 403 / TOM8 S01: 4
TOM 8 Non-linear and Quantum Optics

Photon-photon interactions using a single quantum emitter in a photonic waveguide

Hanna Le Jeannic

CNRS, France


9:00am - 10:30amTOM9 S04: Opto-electronic Nanotechnologies and Complex Systems: Novel effetcts II and chirality
Location: B231
Session Chair: Silvia Romano, CNR, Italy
9:00am - 9:30am
ID: 134 / TOM9 S04: 1
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Polarization singularities and optical chirality in dielectric metasurfaces

Lucio Claudio Andreani1, Dario Gerace1, Momchil Minkov2, Luca Zagaglia1, Simone Zanotti1

1Department of Physics, University of Pavia, Italy; 2Flexcompute, Inc., Belmont, MA 02478, USA

We theoretically study the relation between polarization singularities and optical properties in dielectric metasurfaces, or photonic crystal slabs. We focus on nondegenerate photonic bands leading to symmetry-protected Bound States in a Continuum (BICs). First, we discuss how BICs lead to polarization singularities in the far field, whose winding numbers – or topological charges – follows from the symmetry of the lattice. Then, we determine the polarization properties via the Stokes parameters, focusing on the conditions for the occurrence of a nonvanishing circular polarization. Finally, we calculate the optical response in reflection and the degree of circular dichroism. The results shed light on the role of polarization singularities and symmetry in determining the optical chirality.

9:30am - 9:45am
ID: 330 / TOM9 S04: 2
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Metasurface Characterization by using Stokes Parameters

Rincy Kunjumov, Fabio Antonio Bovino, Riccardo Falsini, Concita Sibilia

Università di Roma La Sapienza, Italy

The development of metamaterials-based devices and applications has sparked a surge in interest since they were first realized. Metamaterials are novel artificial materials with unique electromagnetic properties not seen in natural materials. Natural materials such as glass, diamond, wood such have positive electrical permittivity, magnetic permeability, and an index of refraction. But for some other newly engineered metamaterials have negative values for the mentioned material parameters. With these unusual material parameters, Various forms of miniaturized antennas and microwave components/devices for the wireless communications and defence industries can be designed. Metamaterials also can precisely control how light travels through a material. This enables optical systems that were traditionally bulky to be reduced to tiny sizes. We analysed the characterisation of the Metasurface Samples Au-Nanosphere and Au-Nanohole.Characterization was done with the help of stokes parameters by analysis the information about the output polarization of light once the generated input polarization of light interacts with the passive Metasurface samples. Prepared input polarization is pure, and it is equivalent to the quantum representation |φ> (ket). State that after the sample interaction is <φ| (bra)

9:45am - 10:15am
ID: 233 / TOM9 S04: 3
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Characterization of output circular polarization degree in lowcost asymmetric metasurfaces

Emilija Petronijevic1, Alessandro Belardini1, Zakaria El-ansary2, Bilal Brioual3, Hari Prasath Ram Kumar1, Tiziana Cesca4, Carlo Scian4, Giovanni Mattei4, Concita Sibilia1

1Sapienza University of Rome, Italy; 2Ibn Tofail University Kénitra, Morocco; 3Abdelmalek Essaâdi University Tanger, Morocco; 4University of Padova, Physics and Astronomy Department, Padova, Italy

Addition of asymmetry in plasmonic nanostructures can lead to chiro-optical phenomena, usually monitored as different absorption of left and right polarization, i.e. circular dichroism. Moreover, interesting features arise when the nanostructure changes the polarization state of the input beam. In this work, we perform extrinsic chirality characterization in a widely tuneable near-infrared range, by monitoring both polarization of the input and of the transmitted beam. We characterize low-cost metasurfaces based on polystyrene nanospheres asymmetrically covered by Ag, by exciting them at different angle of incidence with left, right and linear polarization. We then resolve the circular polarization degree of the transmitted beam, demonstrating resonance-governed circular polarization degree in the output, showing the interplay of both intrinsic and extrinsic chirality.

10:30am - 11:00amCoffee Break - Visit the Exhibition
Location: Lunch & Coffee Tent
11:00am - 11:15amEOS PRIZE CEREMONY
Location: Auditorium
Session Chair: Humberto Michinel Álvarez, Universidade de Vigo, Spain

The EOS Prize is awarded for the best paper published in the open access online journal of the EOS (JEOS:RP)

11:15am - 12:00pmPLENARY SPEECH: Silvia Vignolini
Location: Auditorium
Session Chair: Magnus Jonsson, Linköping University, Sweden

Professor at University of Cambridge, United Kingdom

Title: Light management for control of visual appearance, from nature to applications

12:00pm - 1:00pmPOSTER SESSION and Exhibition
Location: Hallway

The same posters will be presented on Wednesday's and Thursday's sessions.

ID: 327
TOM 1 Silicon Photonics and Guided-Wave Optics

DC Kerr effect in silicon waveguide

Jonathan Peltier1,2, Léopold Virot2, Christian Lafforgue1, Lucas Deniel1, Delphine Marris-Morini1, Guy Aubin1, Farah Amar1, Denh Tran3, Callum G. Littlejohns3, David J. Thomson3, Weiwei Zhang3, Laurent Vivien1

1University Paris Saclay, CNRS, Centre for Nanoscience and Nanotechnology (C2N), Palaiseau, 91120, France; 2University Grenoble Alpes, CEA, LETI, Grenoble, 38000, France; 3Optoelectronics Research Centre, Zepler Institute for Photonics and Nanoelectronics, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, UK

Integrated modulators are key components for communications, quantum, spectroscopy or LIDAR. These components require high-speed modulation and low power consumption. Silicon modulators, which are mainly based on the plasma dispersion effect, consume a lot of power and are limited in bandwidth. To overcome these limitations, such modulators can also rely on Pockels effect, an inherently fast and pure phase modulation effect. Since silicon does not have a natural chi2 due to its centrosymmetric structure, pure phase modulators cannot be achieved directly with silicon waveguides. Nevertheless, pure phase modulation in silicon can be realized either by associating materials with high chi2 such as polymer, BTO, PZT, lithium niobate, by straining silicon, or by using DC Kerr effect to electrically induce an effective chi2. The latter is studied in this paper for light modulation in a silicon Mach-Zehnder modulator based on PIN junctions. A clear linear behavior of the dynamic electro-optic response has been demonstrated under a reverse bias applied across a PIN junction. A modulation at twice the RF frequency applied is also shown and assigned to Kerr effect.

ID: 165
TOM 1 Silicon Photonics and Guided-Wave Optics

Hybrid polymer-titania waveguides for highly integrated circuits

Isaac Doughan, Kehinde Oyemakinwa, Olli Ovaskainen, Matthieu Roussey

University of Eastern Finland, Finland

We present an innovative waveguide based on the hybridization of a titanium dioxide nano-waveguide within a polymer strip. Through simulations and design, we demonstrate that the waveguide sustains principally the quasi-TM fundamental mode and that even in tight bends (radius smaller than 2 µm) light remains confined in the titania layer. Such a waveguide, in addition to enabling low loss propagation is a way towards efficient evanescent sensing in highly integrated scheme, i.e., small footprint. We also show that the fabrication, here based on electron beam lithography and atomic layer deposition, can be extended easily to large scale manufacturing using nanoimprinting technology.

ID: 179
TOM 7 Thermal radiation and energy management

Polycrystalline MoO3 films fabricated by pulsed laser deposition for infrared polarization manipulation.

Daniele Ceneda1, Federico Vittorio Lupo2, Maria Pia Casaletto3, Roberto Macaluso2, Marco Centini1, Sina Abedini Dereshgi4, Koray Aydin4, Maria Cristina Larciprete1

1Department of Basic and Applied Sciences for Engineering, SAPIENZA, University of Rome, Via A. Scarpa 16, 00161, Roma, Italy; 2Department of Engineering, University of Palermo, Viale delle Scienze, Ed. 9, Palermo, 90128, Italy; 3National Research Council (CNR), Institute of Nanostructured Materials (ISMN), Via Ugo La Malfa 153, Palermo, 90146, Italy; 4Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois 60208, United States

We performed infrared optical characterization of polycrystalline MoO3 films deposited by pulsed laser deposition on fused silica substrates. Several samples have been fabricated using different parameters such as temperature and oxygen pressure. Our analysis shows that under appropriate fabrication conditions it is possible to obtain a dominant alpha-phase film, with a well-defined, normal to surface (z-axis) orientation. These results are confirmed by reflection spectra performed at 45° incidence angle revealing a strong modulation of the sharp z-phonon Reststrahlen band as a function of the incident field linear polarization.

ID: 314
TOM 6 Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and devices

Laser-printed emissive metasurface implemented with a planar thin-film resonator

Myeongkyu Lee, Yeongseon Kim, Dongkyun Kang, Jaeyong Kim

Yonsei University, Korea, Republic of (South Korea)

Optical security is a promising application of metasurfaces because light has large degrees of freedom in metasurfaces. Although many different structures/materials have been proposed for this purpose, the fabrication of dynamic metasurfaces in a straightforward and scalable manner while maintaining a high security level remains a significant challenge. Herein, a metasurface consisting of a phase-changing GeSbTe layer and a thin metal back reflector is presented to space-selectively and dynamically control the infrared emission of the surface by a spatially modulated pulsed laser beam. Unlike conventional laser processes using a focused beam, the employed laser printing is an expanded beam-based parallel process that enables the fabrication of wafer-sized emission patterns. Owing to the multispectral responses of GeSbTe, mutually independent visible and infrared images can be printed in one region. Grayscale emission patterns can also be obtained by gradually modulating the spatial profile of the laser beam, which makes the replication of laser-printed emission patterns extremely difficult. These encouraging features are experimentally verified using banknote and ordinary paper substrates, indicating that the presented emissive metasurface has the potential for use as an effective platform for anti-counterfeiting

ID: 171
TOM 11 Tapered optical fibers, from fundamental to applications

Operating range of efficient Raman converters based on nanofibers immersed in different liquids

Maha Bouhadida, Pierre-Enguerrand Verdier, Philippe Delaye, Sylvie Lebrun

Laboratoire Charles Fabry, France

We present the operating range of Raman wavelength converters based on silica nanofibers immersed in liquids for the design of all fibered wavelength converters. This range is bounded on the lower limit by the pump energy necessary to reach the Raman threshold and on the upper limit by the laser induced breakdown of the nanofiber. These breakdown energies are measured in the ns regime for different liquids (water, ethanol, isopropanol) and for air. We finally define guidelines that open the way to a new family of low-cost compact and efficient all-fibered Raman converters that can be directly inserted in optical fibered networks with very low losses.

ID: 258
TOM 13 Advances and Applications of Optics and Photonics

Characterization of a lobster-eye type X-ray telescope

Thorsten Döhring1, Veronika Stieglitz2,3, Rene Hudec3,4, Iryna Sapsai5, Peter Friedrich2, Vadim Burwitz2

1TH Aschaffenburg, Germany; 2Max-Planck-Institute for Extraterrestrial Physics, Germany; 3Czech Technical University in Prague, Czech Republic; 4Astronomical Institute, Czech Academie of Science, Czech Republic; 5Borys Grinchenko Kyiv University, Ukraine

Lobster-eye type X-ray telescopes use reflecting plano mirrors under grazing incidence and can observe a large field of view. As part of a Bavarian-Czech cooperation, two telescopes were build, equipped with mirrors coated with gold and iridium. Their X-ray characterization was carried out at the PANTER test facility, which simulates parallel starlight incident on the telescopes. The telescopes have an angular resolution of about 4 arc minutes in X-rays and a focal length of about 2 meters. The used X-ray mirrors reflect and focus visible light as well; their functionality in the optical regime was checked in laboratory tests. Now another test campaign will be carried out to examine the telescope resolution for real objects of the visible night sky and the imaging properties for star constellations.

ID: 223
TOM 11 Tapered optical fibers, from fundamental to applications

Single-mode ZBLAN fiber couplers

Mohsen Rezaei, Gebrehiwot Tesfay Zeweldi, Md Hosne Mobarak Shamim, Martin Rochette

McGill University, Canada

We demonstrate single-mode ZBLAN optical fiber couplers. A controlled tapering procedure leads to coupling ratios of 5%/95% and 14%/86% at a wavelength of 2200 nm, with insertion losses of 1.6 dB and 1.8 dB, respectively.

ID: 241
TOM 10 Frontiers in Optical Metrology

Retardance measurement by spatially probing the sample with optical vortices

Tomas Fordey, Petr Schovanek

Palacky University Olomouc, Czech Republic

Modern optical systems utilize various degrees of freedom, such as polarization, for shaping and controlling the light. Common representative of such a component is spatial light modulator (SLM), consisting of liquid crystal display, allowing for imposing predetermined retardation with given orientation of optical axis of anisotropy. Therefore, it is widely used for polarization coded phase shifting, polarization splitting of wavefront in digital holography etc. Narrowing tolerance in optical experiments puts higher demands on precise setting of the modulator and the parameters set. Consequently, measuring such devices and their parameters is essential for proper functionality. We present a single shot, common path method for measuring retardance map of the modulator, based on spatial probing the modulator with point images of spatially coherent light source and transforming them to optical vortices.

ID: 238
TOM 13 Advances and Applications of Optics and Photonics

Intelligent Optical Tweezers with deep neural network classifiers

Vicente Vieira Rocha1,2, João M. F. Oliveira1,2, Ariel R. N. S. Guerreiro1,2, Pedro A. S. Jorge1,2, Nuno A. Silva1,2

1INESC TEC, Centre of Applied Photonics, Rua do Campo Alegre 687, 4169-007 Porto, Portugal; 2Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal

Optical tweezers use light to trap and manipulate mesoscopic scaled particles with high precision making them a useful tool in a plethora of natural sciences, with emphasis on biological applications. In principle, the Brownian-like dynamics reflect trapped particle properties making it a robust source of information. In this work, we exploit this information by plotting histogram based images of 250ms of position or displacement used as input to a Convolution Neural Network. Results of 2-fold stratified cross-validation show satisfying classifications between sizes or types of particles: Polystyrene and Polymethilmethacrylate thus highlighting the potential of CNN approaches in faster and non-invasive applications in intelligent opto and microfluidic devices using optical trapping tools.

ID: 163
TOM 13 Advances and Applications of Optics and Photonics

Secure key distribution using an ultra-long fiber laser with bi-directional EDFA

Beatriz Gomes Soares1, Ariel Ricardo Negrão da Silva Guerreiro1,2, Orlando José dos Reis Frazão1

1INESC TEC, Portugal; 2Faculdade de Ciências da Universidade do Porto, Portugal

In this paper we describe the implementation of a secure key distribution system based on an ultra-long fiber laser with a bi-directional erbium doped fiber amplifier. The resilience of the system was tested against passive attacks from an eavesdropper, having been observed a similarity in spectrum for both secure configurations of the system.

ID: 277
TOM 5 Resonant Nanophotonics

Optical characterization of DNA origami-shaped silver nanoparticles created through biotemplated lithography

Kabusure Mogasa Kabusure1, Petteri Piskunen2, Jiaqi Yang1, Mikko Kataja1, Mwita Chacha1, Sofia Ojasalo2, Boxuan Shen2,3, Tommi Hakala1, Veikko Linko2,4

1Department of Physics and Mathematics, University of Eastern Finland, Yliopistokatu 2, P.O Box 111, FI-80101, Joensuu, Finland.; 2Biohybrid Materials, Department of Bioproducts and Biosystems, Aalto University, P.O. Box 16100, FI-00076, Aalto, Finland.; 3Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 17165 Stockholm, Sweden.; 4LIBER Centre, Aalto University, P.O. Box 16100 FI-00076, Aalto, Finland.

Here, we study optically resonant substrates fabricated using the previously reported BLIN (biotemplated lithography of inorganic nanostructures) technique with single triangle and bowtie DNA origami as templates. We present the first optical characterization of BLIN-fabricated origami-shaped silver nanoparticle patterns on glass surfaces, comprising optical transmission measurements and surface-enhanced Raman spectroscopy. The formed nanoparticle patterns are examined by optical transmission measurements and used for surface-enhanced Raman spectroscopy (SERS) of Rhodamine 6G (R6G) dye molecules.

ID: 226
TOM 11 Tapered optical fibers, from fundamental to applications

Trapping a single atom in the evanescent field of a WGM-resonator

Gabriele Maron1, Xinxin Hu1, Luke Masters1, Lucas Pache1, Michael Scheucher2, Elisa Will2, Jürgen Volz1, Arno Rauschenbeutel1

1Humboldt Universität zu Berlin, Germany; 2Vienna Center for Quantum Science and Technology, TU Wien – Atominstitut, Austria

Whispering-gallery-mode (WGM) resonators are monolithic structures that guide light by total internal reflection.They exhibit ultra-high Q-factors and provide lossless in- and out-coupling of light in tapered optical fibres. Thus, WGM resonators can be realized in a fully integrated way and can be implemented as optical circuits on photonic chips. Furthermore, these resonators provide a chiral (i.e. direction dependent) light-matter interaction, which opens up new routes for photonic quantum information and communication applications.

We demonstrate, for the first time, trapping of single 85Rb atoms in the evanescent field of a WGM resonator by means of a tightly focused dipole trap retroreflected on the resonator surface. In order to compensate the trap-induced light shift of the atomic transition frequency, an additional light beam is employed to realize a dual-colour magic-wavelength trapping scheme. Using this method, we observe a vacuum Rabi splitting in the transmission spectrum of the coupled atom-resonator system, which indicates its operation in the strong coupling regime.

We are currently implementing a second generation trapping scheme, which will enable deterministic trap loading with improved trap lifetimes and a well-defined coupling strength.

ID: 129
TOM 7 Thermal radiation and energy management

Infrared emittance and polaron conductivity in rutile

Iñigo González de Arrieta1,2, Luis González-Fernández3, Telmo Echániz4, Leire del Campo1, Domingos De Sousa Meneses1, Gabriel A. López2

1CNRS, CEMHTI UPR3079, Univ. Orléans, F-45071 Orléans, France; 2Physics Department, University of the Basque Country UPV/EHU, E-48940 Leioa, Spain; 3Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Alava Technology Park, Albert Einstein 48, 01510 Vitoria-Gasteiz, Spain; 4Applied Mathematics, University of the Basque Country UPV/EHU, E-48013 Bilbao, Spain

Polarised emittance measurements are reported for a rutile-phase TiO2 single crystal up to 2000 K in a broad spectral range. Above 1000 K, strong opacification was observed for most of the investigated spectral range. This phenomenon was thermally activated, with a 1.25 eV activation energy close to that of DC conductivity. The sample became opaque at temperatures significantly below the melting point. This anomalous optical phenomenon can be explained by small-polaron conduction, which is particularly strong for this material. The transition from transparency to high and flat emissivities in a broad near- and mid-infrared region has important implications for the use of TiO2 materials at high temperatures.

ID: 278
TOM 13 Advances and Applications of Optics and Photonics

Micro-reactors fabricated by Subaquatic indirect Laser-Induced Plasma-Assisted Ablation on soda-lime glass substrates.

M.Teresa Flores-Arias1, Ana I. Gomez-Varela1, Alberto P Munuzuri2, Alejandro Carballosa2, Carmen Bao-Varela1

1Photonics4Life research group, Department of Applied Physics, Facultade de Física and Institute of Materials (iMATUS), Universidade de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain; 2Group of Nonlinear Physics, Department of Physics and Galician Center for Mathematical Research and Technology (CITMAga),, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain

Synchronization control of complex systems is a field that emerged with huge interest and aims to study new possible routes to synchronization in networks of non-locally coupled chemical oscillators. Light can be used to stimulate these systems and to be able to synchronize the different micro-reactors involved in the complex system. To this end, transparent reactors with good optical qualities are needed. Glass is the most appropriated material to be used for fabricating the micro-reactors. Subaquatic indirect Laser-Induced Plasma-Assisted Ablation is presented as a laser technique that combines underwater ablation with shock waves as a potential technique for fabricating these micro-reactors by using a Nd:YVO4 laser.

ID: 281
TOM 13 Advances and Applications of Optics and Photonics

The effect of frequency modulation on the FSR of a Fabry-Perot cavity using an Optical Spectrum Analyser

João Manuel Reis1,3, António V. Rodrigues1,2, Paulo Robalinho1,2, Susana Novais1, João Maia1, Paulo Marques1,3, D Roma4,5, J Salvans4,5, M Canal4,5, J Ramos4,5, V Gualani4,5, S Sisteré4,5, V Martin4,5, M Nofrarias4,5, Susana Silva1, Orlando Frazão1

1INESC TEC, Portugal; 2Faculdade de Engenharia da Universidade do Porto,; 3Faculdade de Ciências da Universidade do Porto,; 4Institut de Ciències de l’Espai (ICE, CSIC), Campus UAB; 5Institut d'Estudis Espacials de Catalunya (IEEC)

It is presented a study of the dependence between the free spectral range (FSR) and the cavity length in Fabry-Perot interferometers. Furthermore, the effect of frequency modulation on the FSR is studied when an optical spectrum analyser (OSA) is used as an interrogator. For low frequency range it is possible to observe this behaviour in the OSA and using an appropriate processing signal it is possible to use the white light interferometry technique.

ID: 237
TOM 13 Advances and Applications of Optics and Photonics

Convolutional neural network optimisation to enhance ESPI fringe visibility

Jose Crespo, Vicente Moreno

Universidade de Santiago de Compostela, Spain

The use of convolutional neuronal networks (CNN) for the treatment of interferometric fringes has been introduced in recent years. In this paper, we optimize and build a CNN model, based U-NET architecture, to maximize its performance processing electronic speckle interferometry fringes (ESPI)

ID: 190
TOM 11 Tapered optical fibers, from fundamental to applications

Large evanescently-induced Brillouin scattering at the surrounding of a nanofibre

Jean-Charles Beugnot


Brillouin scattering has been widely exploited for advanced photonics functionalities such as microwave photonics, signal processing, sensing, lasing, and more recently in micro- and nano-photonic waveguides. Due to the small transverse dimension, the tapered optical fiber have a number of optical and mechanical properties that make them very attractive for both fundamental physics and technological applications. Contrary to standard telecom fiber where the Brillouin scattering effect is characterized by a single Lorentzian resonance centred at 10.86 GHz (@ 1550nm), in tapered silica fiber, we identified several Brillouin resonances at different frequencies from 5 GHz to 10 GHz coming from surface, shear and compression elastic waves. And for a large evanescent optical field surrounding the nanofiber, we observe an efficient Brillouin scattering in gas. We show drastic Brillouin scattering enhancement by increasing the gas pressure with a maximum Brillouin which is 79 times larger than in a standard single-mode fibre.

ID: 214
TOM 10 Frontiers in Optical Metrology

Particle detection enhancement by combining coherent Fourier scatterometry with synthetic optical holography

Haoyang Yin, Dmytro Kolenov, S.F. Pereira

TU Delft, Netherlands, The

We demonstrated that the sensitivity of nanoparticle detection on surfaces can be substantially improved by implementing synthetic optical holography (SOH) in coherent Fourier scatterometry (CFS), resulting in a phase-sensitive confocal differential detection technique that operates at a very low power level (P = 0.016 mW). The improvement in sensitivity is due to two reasons: firstly, the boost in the signal at the detector due to the added reference beam, and secondly, the reduction of background noise caused by the electronics.

With this new system, we were able to detect a 60 nm polystyrene latex (PSL) particle at wavelength of 633 nm (\lambda/10) on a silicon wafer with an improvement in the signal-to-noise ratio (SNR) of about 4 dB.

ID: 308
TOM 4 Bio-Medical Optics

3D printed FBG based sensor for vital signal monitoring – Influence of the infill printing parameters

Alexandra Ferreira1, Cátia Tavares1,2, Cátia Leitão1,2, Daniela Lo Presti3, M. Fatima Domingues2, Nélia Alberto2, Hugo Silva4,5, Paulo Antunes1,2

1Department of Physics & I3N, Portugal; 2Instituto de Telecomunicações and University of Aveiro, Aveiro, Portugal; 3Unit of Measurements and Biomedical Instrumentation, Departmental Faculty of Engineering, Università Campus Bio-Medico di Roma, Rome, Italy.; 4Instituto de Telecomunicações, Instituto Superior Técnico, University of Lisbon, Lisbon, Portugal; 5PLUX - Wireless Biosignals, S.A, Lisboa, Portugal

The fused deposition modelling technique has been used in the production of strain sensors in which fibre Bragg gratings (FBGs) are encapsulated during the 3D printing process. This paper reports the study of the influence of the FBG position and the material filling, in this case a flexible polymer material, on the sensors’ sensitivity and overall performance. In addition, this study preliminarily evaluated the ability of the strain sensor to monitor (heart rate) HR and (respiratory rate) RR as a wearable on the wrist and as a non-intrusive solution on the back of an office chair

ID: 184
TOM 4 Bio-Medical Optics

Polarization sensitive digital holographic imaging in biology

Giuseppe Coppola1, Maria Mangini2, Gianluigi Zito1, Edoardo De Tommasi1, Anna Chiara De Luca2, Maria Antonietta Ferrara1

1National Research Council, Institute of Applied Sciences and Intelligent Systems ‘E. Caianiello’; 2National Research Council, Institute of Experimental Endocrinology and Oncology ‘G. Salvatore’

A new, simple digital holography-based polarization microscope for quantitative birefringence imaging of biological cells is presented. As a proof of concept, two different class of cells have been characterized by polarization sensitive digital holographic imaging (PSDHI). These two cases study reported are: differentiation of leukaemia cells and identification of reacted sperm cells. Although further experimentation is necessary, the suggested approach could represent a prospective label-free diagnostic tool for use in biological and medical research and diagnosis.

ID: 195
TOM 8 Non-linear and Quantum Optics

Static multi-vortex structures in nonlinear optical media

Angel Paredes, Jose Ramón Salgueiro, Humberto Michinel

Universidade de Vigo, Spain

We demonstrate through numerical simulations the existence of a new type of nonlinear waves in optical media: structures of vortex solitons that remain static in certain configurations, which depend on their relative positions and topological charges. Several examples are presented to illustrate this surprising behavior.

ID: 152
TOM 13 Advances and Applications of Optics and Photonics

Determination of a source's temporal coherence function via depolarization in liquid crystal

Cristian Eduardo Hernández Cely, Rafael Angel Torres Amaris

Universidad Industrial de Santander, Colombia

Based on the fact that the degree of polarization of a light source is given in terms of the absolute value of its complex degree of coherence, we design a depolarization experiment using a variable retarder in which we measured the degree of polarization as a function of the retarder's birefringence. We show that if the incident light is previously linearly polarized we can perform a direct measurement of the light source's coherence using a Stokes meter.

ID: 144
TOM 8 Non-linear and Quantum Optics

Multi-beam vortex generation induced by the non-linear optical anisotropy of graphene.

Luis Plaja, Ana García-Cabrera, Roberto Boyero-García, Óscar Zurrón, Julio San Román, Carlos Hernández-García

Universidad de Salamanca, Spain

We analyse the high harmonic emission from single-layer graphene driven by infrared vector beams. We demonstrate that graphene’s anisotropy offers a privileged scenario to explore non-trivial light spin-orbit couplings, which substantially extends the possibilities for the generation of high-harmonic structured beams currently studied in atomic and molecular targets. In our case, graphene’s crystal symmetry introduces a spin-dependent diffraction pattern that, coupled with the fundamental conservation of the driver’s topological phase, leads to the splitting of the harmonic field in a multi-beam structure, composed of spatially diverging vortices. Our work demonstrates that anisotropic targets are extraordinary tools to sculpt complex structured short-wavelength beams.

ID: 191
TOM 4 Bio-Medical Optics

Open-view binocular double-pass system for the study of dynamic accommodation

Fracisco Ávila1, Rafael Navarro2, Ebrahim Safarian Baloujeh2, Ana Sánchez-Cano1

1Departamento de Física Aplicada, Universidad de Zaragoza, Zaragoza, 50009, Spain; 2INMA, Consejo Superior de Investigaciones Científicas & Universidad de Zaragoza, Zaragoza, 50009, Spain

We present a new open-view dynamic double-pass (DP) system for the study of accommodative response in binocular natural viewing conditions. The DP point spread function (PSF) of the eye is analyzed to compute the Visual Strehl Ratio (VSR) fluctuation as a function of time at 50 Hz frame rate. Preliminary results showed that the proposed method can quantify the temporal dynamic of the optical and visual quality of both eyes simultaneously.

ID: 193
TOM 10 Frontiers in Optical Metrology

Hybrid optical measurement technique for detection of defects in epitaxially grown 4H-SiC layers

Elena Ermilova, Matthias Weise, Andreas Hertwig

Bundesanstalt für Materialforschung und –prüfung (BAM), Germany

Recent developments in power electronics require the use of new wide bandgap compound semiconductor. We demonstrate the use of the ellipsometry and white light interference microscopy to detect defects in epitaxially grown SiC layers on SiC substrates. Such hybrid optical metrology methods can be used to better understand the mechanism of the development of the defects as well as their effects on the material´s optoelectronic properties.

ID: 215
TOM 10 Frontiers in Optical Metrology

Multi-beam coherent Fourier scatterometry

Sarika Soman, Silvania F. Pereira

Delft University of Technology, Netherlands, The

Recent technological advancements in the past decades have been driven by the miniaturisation of devices using surfaces with nano-scale features. These advancements require fast, large area measurement techniques that can be used in process control to detect surface contaminations or to monitor fabrication quality. Here we present a modified version of the scanning coherent Fourier scatterometer with multiple beams that can be used to scan larger areas without increasing the scan time or decreasing the spatial resolution.

ID: 273
TOM 8 Non-linear and Quantum Optics

Nonlinear pulse routing in plasmonic couplers

José Ramón Salgueiro1, Albert Ferrando2

1Universidade de Vigo, Spain; 2Universitat de València, Spain

We present a system able to discriminate pulses according to their duration with potential applications in all-optical signal multiplexing. The device is based on a directional coupler with nonlinear cores and metallic claddings with dimensions in a nanometric scale. Simulations are carried out using the FDTD technique for ultrashort pulses of femtosecond order. It is shown that the device is able to separate such pulses respect to a time-width threshold which depends on the total energy of the pulse.

ID: 123
TOM 5 Resonant Nanophotonics

A rigorous computational framework employing coupled-mode theory for assessing lasing with transition metal dichalcogenide bilayers in the nanoscale

Georgios Nousios1, Thomas Christopoulos1, Dimitrios C. Zografopoulos2, Emmanouil E. Kriezis1

1School of Electrical and Computer Engineering, Aristotle University of Thessaloniki (AUTH), Thessaloniki GR-54124, Greece; 2Consiglio Nazionale delle Ricerche, Instituto per la Microelettronica e Microsistemi (CNR-IMM), Roma 00133, Italy

A whispering-gallery mode nanophotonic laser cavity having as active medium a transition-metal-dichalcogenide (TMD) bilayer is examined. The proposed system is analysed and designed utilizing a strict and rigorous computational framework based on the coupled-mode theory. Our framework is capable of accurately and efficiently handling the gain properties of two-dimensional materials, such as contemporary TMD monolayers, multilayers, and heterostructures. The presented lasing cavity exhibits an adequately low pump threshold and light emission in the order of milliwatts is predicted. Exploiting the capabilities of the developed framework, we were in position to efficiently design the cavity as well as to estimate quantitative lasing parameters such as the pumping threshold and the lasing frequency.

ID: 120
TOM 5 Resonant Nanophotonics

Controlling chromaticity by lamellar gratings

Hiroyuki Ichikawa, Naoki Arita, Keigo Shikimi, Ryunosuke Tani

Ehime University, Japan

Fundamental numerical study on controlling chromaticity with the simplest diffractive structure is carried out. Observed various characteristics on transmission/reflection and dielectric/metal will be useful guidelines for practical optimisation of device structures.

ID: 150
TOM 8 Non-linear and Quantum Optics

Light propagation in disordered aperiodic Mathieu photonic lattices

Jadranka M Vasiljević1, Dejan V Timotijević2, Dragana M Jović Savić1

1Institute of Physics, University of Belgrade, Belgrade, Serbia; 2Institute for Multidisciplinary Research, University of Belgrade, Belgrade, Serbia

We present the numerical modeling of two different randomization methods of photonic lattices. We compare the results of light propagation in disordered aperiodic and disordered periodic lattices. In disordered aperiodic lattice disorder always enhances light transport for both methods, contrary to the disordered periodic lattice. For the highest disorder levels, we detect Anderson localization for both methods and both disordered lattices. More pronounced localization is observed for disordered aperiodic lattice.

ID: 251
TOM 13 Advances and Applications of Optics and Photonics

Chip integrated photonics for ion based quantum computing

Steffen Sauer1,2, Anastasiia Sorokina1,2, Carl-Frederik Grimpe3, Guochun Du3, Pascal Gehrmann1,2, Elena Jordan3,5, Tanja Mehlstäubler3,4, Stefanie Kroker1,2,3

1Institut für Halbleitertechnik, Technische Universität Braunschweig, Hans-Sommer-Str. 66, 38106 Braunschweig, Germany; 2Laboratory for Emerging Nanometrology, Langer Kamp 6a/b, 38106 Braunschweig, Germany; 3Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany; 4Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany; 5DLR-Institut für Satellitengeodäsie und Inertialsensorik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany

Ion traps are a promising platform for the realisation of high-performance quantum computers. To enable the future scalability of these systems, integrated photonic solutions for guiding and manipulating the laser light at chip level are a major step. Such passive optical components offer the great advantage of providing beam radii in the µm range at the location of the ions without increasing the number of bulk optics. Different wavelengths, from UV to NIR, as well as laser beam properties, such as angle or polarisation, are required for different cooling and readout processes of ions. We present simulation results for different optical photonic components, such as grating outcouplers or waveguide splitters and their applications on ion trap chips. Furthermore, we will introduce the experimental setup for the optical characterisation of the fabricated structures.

ID: 287
TOM 3 Optical System Design, Tolerancing and Manufacturing

Design and testing of a Kirkpatrick-Baez optics variation

Veronika Stieglitz1,2, Vadim Burwitz1, Thorsten Döhring3, René Hudec2, Stanislav Vitek2

1Max Planck Institute for Extraterrestrial Physics, Germany; 2Czech Technical University in Prague, Czech Republic; 3TH Aschaffenburg – University of Applied Science, Germany

Beside Wolter I X-ray optics, which are used at most in currently operating X-ray space telescopes, there exist also other optical designs and their usability for space observations is still the matter of studies. This article covers preliminary testing results of an optical module which is based on a modified Kirkpatrick-Baez optics. This X-ray optics, consisting of four sub-modules, was assembled in Prague and tested at the PANTER test facility of MPE afterward. The sub-modules use different reflective coatings, in part developed by our research group, on complementary flat mirrors, which approximate the shape of a Kirkpatrick-Baez optical design. In this contribution we summarise the design of the optical modules, the details of applied coating layers, and the X-ray characterisation results at the PANTER test facility.

ID: 261
TOM 8 Non-linear and Quantum Optics

Dynamics of passive modelocking in class-B lasers with saurable absorber

Franco Prati1, Auro Perego2, German de Valcarcel3

1Unversità dell'Insubria, Italy; 2Aston University, UK; 3Universitat de Valencia, Spain

We address the problem of passive modelocking in class-B lasers with saturable abosrber taking into account the fast dynamics of both gain and absorption. Our model, which is derived from a delay differential equation model, treats in a rigorous way the definition of the fast and slow times which are typically used in the master equation approach. In that way all the dynamical variables obey exact periodic boundary conditions and this makes the model suitable for analytic and numerical treatment. The model accounts for behaviours different from fundamental modelocking, such as Q-switching modelocking and harmonic modelocking.

ID: 234
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Experiments and simulations of chiro-optical response in low-cost nanohole arrays in silver

Emilija Petronijevic1, Zakaria El-ansary2, Bilal Brioual3, Alessandro Belardini1, Hari Prasath Ram Kumar1, Tiziana Cesca4, Carlo Scian4, Giovanni Mattei4, Concita Sibilia1

1Sapienza University of Rome, Italy; 2Ibn Tofail University Kénitra, Morocco; 3Abdelmalek Essaâdi University Tanger, Morocco; 4University of Padova, Physics and Astronomy Department, Padova, Italy

2D metasurfaces based on periodic nanoholes in metal have been proposed in various plasmonic platforms. Specifically, their resonant features have led to applications spanning in biosensing. Here we investigate additional degree of freedom in elliptical nanohole arrays with hexagonal geometry: chiro-optical effects. Namely, the in-plane asymmetry and a slightly elliptical shape of nanoholes were previously shown to differently extinct light of opposite handedness, even at normal incidence. We now fully characterize nanoholes in Ag, fabricated by low-cost nanosphere lithography. We first measure the dependence of the transmitted intensity for opposite handedness, in a broad spectral and angle of incidence range. We then resolve the circular polarization degree of the transmitted light when the nanohole array is excited with linear polarization. Finally, we numerically investigate the origin of the chiro-optical effect at the nanoscale. We believe that circular polarization resolving of the transmitted degree could be further adapted as a highly sensitive tool in chiral sensing.

ID: 154
TOM 1 Silicon Photonics and Guided-Wave Optics

Scattering parameters of a non-reciprocal magneto-optical integrated coupler used as an isolator

Yann G. Boucher1,2,4, Yuliya S. Dadoenkova1,2,3, Florian F.L. Bentivegna1,2,3

1CNRS, France; 2Institut FOTON (UMR CNRS 6082); 3Lab-STICC (UMR CNRS 6285); 4École Nationale d’Ingénieurs de Brest

We theoretically investigate a non-reciprocal magneto-optical integrated slab directional coupler.

The scattering parameters of the structure are derived in the frame of the Coupled-Mode Theory (CMT). By properly designing the coupler, it is possible to achieve a perfect non-reciprocity (with 100% contrast) between the two directions of propagation. Other operating points can also be defined, especially since modal dispersion in the spectral domain is naturally taken into consideration.

ID: 199
TOM 1 Silicon Photonics and Guided-Wave Optics

Tantalum pentoxide micro-resonators for frequency comb generation

Jake Daykin1, Jonathan R C Woods2, Stephen C Richardson1, Oliver J Trojak1, Folly Eli Ayi-Yovo3, Jonathan M Silver3, Nicholas T Klokkou1, Amy S K Tong4, Patrick Gill3, Alberto Politi1, Peter Horak4, James S Wilkinson4, Vasilis Apostolopoulos1

1School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ; 2Aquark Technologies, Unit 2, Abbey Enterprise Centre, Premier Way, Abbey Park Industrial Estate, Romsey, Hampshire, SO51 9AQ; 3National Physical Laboratory, Hampton Rd, Teddington, TW11 0LW; 4Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ

We present the design, fabrication, simulation and initial characterisation of tantalum pentoxide (Ta2O5) optical waveguides and micro-ring resonators for the purpose of supercontinuum and frequency comb generation. Spectral broadening results are presented for linear Ta2O5 waveguides for a range of central pump wavelengths between 900 nm and 1500 nm. These results are used as the basis for the dispersion engineering and development of Ta2O5 micro-ring resonators. The losses for sputtered and TEOS PECVD deposited SiO2 top cladded waveguides are characterised using a Fabry-Pérot loss measurement set-up. A solver based on the Lugiato-Lefever equation is presented and used to simulate the expected emission from the Ta2O5 micro-ring resonators. Promising initial experimental results show critical coupling and a Q-factor of 3.7×10^4.

ID: 367
TOM 3 Optical System Design, Tolerancing and Manufacturing

Design of an optical parametric oscillator using a BBO partial cylinder for a continuous tunability between 0.4 µm and 0.9 µm

Baptiste Bruneteau1,2, Basile Faure1, Jérôme Debray2, Dazhi Lu3, Grégoire Souhaité1, Jiyang Wang4, Patricia Segonds2, Benoît Boulanger2

1Teem Photonics, France; 2Univ. Grenoble Alpes, CNRS, Institut Néel, France; 3Shandong University, State Key Lab of Crystal Materials, China; 4Tianjin University of Technology, Institute of Functional Crystals, China

This work describes the different steps of the design of a cylindric Optical Parametric Oscillator. It is based on a BBO nonlinear crystal shaped as a partial cylinder to be pumped by a commercial micro-laser at 0.355 µm for an energetic and sub-nanosecond emission continuously tunable between 0.4 µm and 0.9 µm.

ID: 395
Post Deadline submission

Selective femtosecond and picosecond infrared laser crystallization of an amorphous Ge/Si multilayer stack

Nadezhda M. Bulgakova1, Vladimir A. Volodin2,3, Yuzhu Cheng3, Yoann Levy1, Jiri Beranek1,4, Siva Sankar Nagisetty1,5, Martin Zukerstein1, Alexander A. Popov6, Alexander V. Bulgakov1

1HiLASE Centre, Institute of Physics of the Czech Academy of Sciences, Dolni Brezany, Czech Republic; 2Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk, Russia; 3Novosibirsk State University, Novosibirsk, Russia; 4Czech Technical University, Faculty of Nuclear Sciences and Physical Engineering, Prague, Czech Republic; 5Coherent LaserSystems GmbH & Co. KG, Goettingen, Germany; 6Valiev Institute of Physics and Technology, Yaroslavl Branch, Russian Academy of Sciences, Yaroslavl, Russia

We report on single-short laser crystallization of Ge/Si multilayer stacks consisting of alternating amorphous nanosized films of silicon and germanium using near- and mid-infrared femtosecond and picosecond laser pulses. The phase composition of the irradiated stacks was investigated by the Raman scattering technique. Several non-ablative regimes of crystallization were found, from partial crystallization of germanium without intermixing the Ge/Si layers to complete intermixing of the layers with formation of GexSi1-x solid alloys. The roles of one- and two-photon absorption, thermal and non-thermal (ultrafast) melting processes, and laser-induced stresses in selective pico- and femtosecond laser annealing are analysed based on theoretical estimations and comparison with experimental data. It is concluded that, due to a mismatch of the thermal expansion coefficients between the adjacent stack layers, efficient explosive solid-phase crystallization of the Ge layers is possible at relatively low temperatures, well below the melting point. The possibility of ultrafast non-thermal phase transition in germanium in the studied regimes is also discussed.

1:00pm - 2:30pmLUNCH - Visit the Exhibition
Location: Lunch & Coffee Tent
2:30pm - 4:00pmTOM1 S03: Silicon Photonics and Guided-Wave Optics
Location: B116
Session Chair: Colin James Mitchell, University of Southampton, United Kingdom
2:30pm - 2:45pm
ID: 348 / TOM1 S03: 1
TOM 1 Silicon Photonics and Guided-Wave Optics

Integrated optical phased arrays with circular architecture on a silicon platform

Daniel Benedikovic

University of Zilina, Slovak Republic

Optical phased arrays (OPAs) are now at the forefront of photonic research as a key beam steering technology for myriad of photonic applications, including in light detection and ranging (LIDAR), communications, and metrology, among others. Integrated OPAs with narrow beam widths and wide-angle steering are in critical need, especially for LIDARs in autonomous vehicle, drone and airplane navigation, or satellites. In this work, we numerically study the performances of OPAs having a circular layout arrangement. Compared to recently available solutions with 1D linear or 2D rectangular arrays, the proposed circular OPAs are poised to deliver effective suppression of the grating sidelobes, while improving beam steering range and obtaining narrower beamwidths. We demonstrate 110-element circular arrays with sidelobe suppression better than 10 dB and an angular beamwidth of 0.5°. Under a monochromatic operation at a 1550 nm wavelength, such array provides a solid angle steering range of 0.21π-sr, with a perspective for performance improvement by using large number of OPA elements and operating under broader spectral range.

2:45pm - 3:15pm
ID: 374 / TOM1 S03: 2
TOM 1 Silicon Photonics and Guided-Wave Optics

Advanced subwavelength metamaterial engineered devices for silicon photonics

Inigo Molina Fernandez

University of Malaga, Spain


3:15pm - 3:45pm
ID: 379 / TOM1 S03: 3
TOM 1 Silicon Photonics and Guided-Wave Optics

Ultra-low loss Si3N4 photonics platform

Quentin Wilmart

CEA-Leti, France

Ultra-low loss waveguides with tight confinement present a great interest for a wide range of applications such as quantum photonics, data-communication, neuromorphic computing, LiDAR and microwave optic. Here, we present our 200mm photonics platform based on 800nm-thick Si3N4 waveguides with high fabrication yield and wafer scale optical losses below 5dB/m.

3:45pm - 4:00pm
ID: 321 / TOM1 S03: 4
TOM 1 Silicon Photonics and Guided-Wave Optics

Highly-efficient and compact metamaterial surface grating antenna on a 300-nm silicon-on-insulator platform

Shahrzad Khajavi1, Daniele Melati3, Pavel Cheben2, Jens H. Schmid2, Dan Xia Xu2, Winnie N. Ye1

1Carleton University, Canada; 2National Research Council Canada; 3CNRS, Université Paris-Saclay

We present a high-efficiency silicon-based surface grating antenna in a 300-nm silicon-on-insulator platform. The antenna is based on metamaterial engineered L-shaped radiating nanostructures, yielding an efficiency approaching 90% and a compact footprint less than 8 µm × 5 µm.

2:30pm - 4:00pmTOM10 S01: Frontiers in Optical Metrology: Scatter techniques
Location: B031
Session Chair: Juergen Czarske, TUD, Germany
2:30pm - 3:00pm
ID: 265 / TOM10 S01: 1
TOM 10 Frontiers in Optical Metrology

Practical limits and opportunities with speckle metrology

Mikael Sjödahl

Luleå University of Technology, Sweden

In this presentation, the role of speckles as a carrier of information in phase-based optical metrology is re-visited. Starting with the fundamental mechanisms for speckle decorrelation it is shown that information about the state of an object is transferred through the modified mutual coherence function and can be detected either through the phase, speckle movement, speckle decorrelation or as a combination. The presentation is focusing on practical scale laws that set the limit for what is possible to achieve with present day technology and is demonstrated with a few examples incorporating measurements of microstructural changes, strain, shape, lenses and other refractive index objects.

3:00pm - 3:15pm
ID: 111 / TOM10 S01: 2
TOM 10 Frontiers in Optical Metrology

Influence of displacement gradients on laser speckle photography

León Schweickhardt1, Andreas Tausendfreund1, Dirk Stöbener1,2, Andreas Fischer1,2

1University of Bremen, Bremen Institute for Metrology, Automation and Quality Science (BIMAQ), Germany; 2University of Bremen, MAPEX Center for Materials and Processes, Germany

The influence of first and second order displacement gradients on laser speckle photography is investigated in a simulative study that is supported with experimental data. The systematic error is found to scale linearly with the second order gradient, while the random error scales with the first order gradient. The gradient-based error dominates the uncertainty budget of an in-process measurement during single tooth milling close to the machined surface.

3:15pm - 3:30pm
ID: 217 / TOM10 S01: 3
TOM 10 Frontiers in Optical Metrology

Coherent Fourier scatterometry for particle detection on structured surfaces

Anubhav Paul, Dmytro Kolenov, Silvania F. Pereira

TU Delft, Netherlands, The

We demonstrate the detection of particles/contamination present on a structured surface using Coherent Fourier scatterometry (CFS) by applying Fourier filtering to the scanned maps, which eliminates background effects due to the electronic noise as well the structure itself. We show that by using filters in the Fourier space we can significantly improve the detection capabilities of the particles present on the structure.

3:30pm - 3:45pm
ID: 257 / TOM10 S01: 4
TOM 10 Frontiers in Optical Metrology

Coherent Fourier Scatterometry for defect detection on SiC samples

Jila Rafighdoost, Dmytro Kolenov, Silvania F. Pereira

Delft University of Technology (TU Delft), Netherlands, The

Coherent Fourier Scatterometry (CFS) is a scatterometry technique that has been applied for grating and nanoparticle detection. Here, it has been challenged to verify the detectability of the so-called killer defects on SiC samples for power electronic applications. It has been shown that CFS is able to precisely recognize these defects regardless of their shape or size. CFS could be considered as a possible alternative for this purpose.

3:45pm - 4:00pm
ID: 197 / TOM10 S01: 5
TOM 10 Frontiers in Optical Metrology

Characterisation of nanowire structures with scatterometric and ellipsometric measurements

Jana Grundmann, Tim Käseberg, Bernd Bodermann

Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany

Nanowire structures arranged in a hexagonal lattice are to be characterized in terms of their diameter, height and pitch. A scatterometer and an imaging Mueller matrix ellipsometer, which is a combination of a commercial Mueller matrix ellipsometer and a microscope, have been used as measurement tools. These measurements are supported by numerical simulations using the finite element method to characterize the structure parameters.

2:30pm - 4:00pmTOM13 S05: Advances and Applications of Optics and Photonics
Location: B035
Session Chair: Catarina Monteiro, INESCTEC, Portugal
2:30pm - 2:45pm
ID: 141 / TOM13 S05: 1
TOM 13 Advances and Applications of Optics and Photonics

Spectral scaling transformations of nonstationary light

Jyrki Laatikainen1, Matias Koivurova2, Jari Turunen1, Tero Setälä1, Ari T. Friberg1

1University of Eastern Finland, Finland; 2Tampere University, Finland

We present optical systems, which transform isodiffracting nonstationary beams into fields obeying either cross-spectral purity or spectral invariance. The designs are hybrid refractive-diffractive imaging systems, which are able to perform the desired transformations over a broad spectral bandwidth and irrespective of the state of spatial coherence of the input beam.

2:45pm - 3:00pm
ID: 206 / TOM13 S05: 2
TOM 13 Advances and Applications of Optics and Photonics

Cross-spectral purity for nonstationary optical fields

Meilan Luo1,2, Jyrki Laatikainen1, Atri Halder1, Matias Koivurova3, Tero Setälä1, Jari Turunen1, Ari T. Friberg1

1University of Eastern Finland, Finland; 2Hunan Normal University, China; 3Tampere University, Finland

We derive an extended reduction formula for the time-integrated coherence function starting from the cross-spectral purity conditions for nonstationary optical fields. Two types of separable cross-spectral density functions that ensure cross-spectral purity are introduced and their implications are discussed.

3:00pm - 3:15pm
ID: 219 / TOM13 S05: 3
TOM 13 Advances and Applications of Optics and Photonics

A φ-Shaped Bending-Optical Fiber Sensor for the Measurement of Radial variation in Cylindrical Structures

Victor Henrique Rodrigues Cardoso1,4, Paulo Caldas4,5, M. Thereza R. Giraldi2, Orlando Frazão3,4, João Weyl Costa1, José L. Santos3,4

1Federal University of Pará, Applied Electromagnetism Laboratory, Rua Augusto Corrêa, 01, 66075-110, Belém, Pará, Brazil; 2Military Institute of Engineering, Laboratory of Photonics, Praça Gen. Tibúrcio, 80,22290-270, Rio de Janeiro, Brazil; 3Department of Physics and Astronomy, Faculty of Sciences of University of Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal; 4nstitute for Systems and Computer Engineering, Technology and Science, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal; 5Polytechnic Institute of Viana do Castelo, Rua Escola Industrial e Comercial de Nun’Álvares, 4900-347, Viana do Castelo, Portugal

This work presents preliminary results of the $\phi$ -shaped sensor mounted on support designed by additive manufacturing (AM). This sensor is proposed and experimentally demonstrated to measure the radial variation of cylindrical structures. The sensor presents an easy fabrication. The support was developed to work using the principle of leverage. The sensing head is curled between two points so that the dimension associated with the macro bend is changed when there is a radial variation. The results indicate that the proposed sensor structure can monitor radial variation in applications such as pipelines and trees.

3:15pm - 3:30pm
ID: 114 / TOM13 S05: 4
TOM 13 Advances and Applications of Optics and Photonics

How can asphalt mixtures be smart?

Iran Rocha Segundo1,2, Salmon Landi Jr.3, Cátia Afonso2, Orlando Lima Jr.1, Elisabete Freitas1, Verônica Castelo Branco4, Manuel Filipe Costa5, Joaquim Carneiro2

1ISISE, Department of Civil Engineering, University of Minho, Azurém Campus, Guimarães, Portugal; 2Centre of Physics of Minho and Porto Universities (CF-UM-UP), University of Minho, Azurém Campus, Guimarães, Portugal; 3Federal Institute of Education, Science and Technology Goiano, Rio Verde – GO, Brazil; 4Transportation Engineering Department, Federal University of Ceará, Fortaleza, Brazil; 5Centre of Physics of Minho and Porto Universities (CF-UM-UP), University of Minho, Gualtar Campus, Braga, Portugal

The functionalization of asphalt mixtures is carried out in order to provide new capabilities to the road pavements, with major social, environmental and financial benefits. Optical characterization techniques as well as optical processes like photocatalysis play a major role in the development of new asphalt mixtures with smart functions. These advanced capabilities which are being developed in asphalt mixtures are: photocatalytic, superhydrophobic, self-cleaning, de-icing/anti-ice, self-healing, thermochromic, and latent heat thermal energy storage. The main objective of this research work is to stress the importance of optics and photonics technologies giving an overview of advanced functionalized smart asphalt mixtures.

3:30pm - 3:45pm
ID: 399 / TOM13 S05: 5
Post Deadline submission

Padé resummation of divergent Born series and its motivation by analysis of poles

Thomas van der Sijs, Omar El Gawhary, Paul Urbach

Delft University of Technology, Faculty of Applied Sciences, Optics Research Group, Delft, The Netherlands

The Born series is in principle a powerful way to solve electromagnetic scattering problems.

Higher-order terms can be computed recurrently until the desired accuracy is obtained. In practice, however, the series solution often diverges, which severely limits its use. We discuss how Padé approximation can be applied to the Born series to tame its divergence. We apply it to the scalar problem of scattering by a cylinder, which has an analytical solution that we use for comparison. Furthermore, we improve our understanding of the divergence problem by analyzing the poles in the analytical solution. This helps build the case for the use of Padé approximation in electromagnetic scattering problems. Additionally, the poles reveal the region of convergence of the Born series for this problem, which agrees with actual calculations of the Born series.

2:30pm - 4:00pmTOM3 S05: Optical System Design, Tolerancing and Manufacturing
Location: B032
Session Chair: Daewook Kim, University of Arizona, United States of America
2:30pm - 3:00pm
ID: 358 / TOM3 S05: 1
TOM 3 Optical System Design, Tolerancing and Manufacturing

Current freeform metrology methods

Jessica DeGroote Nelson

Optimax, United States of America

Advancements in freeform manufacturing have been substantial in the last decade. The current limiting factor in the production of higher precision freeform manufacturing is metrology. This presentation will survey freeform metrology methods used in the industry today and highlight opportunities for future advancement in the field of freeform metrology to further higher precision freeforms.

3:00pm - 3:15pm
ID: 352 / TOM3 S05: 2
TOM 3 Optical System Design, Tolerancing and Manufacturing

The impact of surface specifications on thin film coatings and vice versa

Sven Schröder

Fraunhofer IOF, Germany

EDIT! Abstract of the paper

3:15pm - 3:30pm
ID: 189 / TOM3 S05: 3
TOM 3 Optical System Design, Tolerancing and Manufacturing

A brief application of material parameters to predict polishing rates for optical glasses

Michael Frederik Benisch1, Christian Trum1, Werner Bogner1, Oliver Fähnle2

1Deggendorf Institute of Technology, Germany; 2Eastern Switzerland University of Applied Sciences

This paper investigates the effects of material parameters of optical glasses on the polishing rate of these glasses. For this purpose, the material removal of various glasses was determined in laboratory tests under identical polishing conditions with respect to polishing pad and polishing suspension. The material removal was then evaluated for its dependence on material parameters. The goal of this paper is to derive a rule of thumb which allows an estimation of the material removal and the obtainable surface quality based on certain parameters of the workpiece material under comparable conditions. This rule of thumb can provide an initial insight into the polishability of a material and can be used to estimate polishing times and achievable surface qualities.

3:30pm - 3:45pm
ID: 284 / TOM3 S05: 4
TOM 3 Optical System Design, Tolerancing and Manufacturing

Ultra-short pulse laser-based fabrication process for lightweight structures in quartz glass applied for mirrors

David Bischof, Michael Kahl, Markus Michler

OST Eastern Switzerland University of Applied Sciences, Switzerland

In the following work a manufacturing process for light weight structures in Fused Silica is presented. Such structures can potentially be used for mirrors to decrease the mass by simultaneously ensuring high stiffness. This talk should give the audience the possibility to assess the selective laser etching technology for mechanical structures in the field of optical mirrors.

3:45pm - 4:00pm
ID: 311 / TOM3 S05: 5
TOM 3 Optical System Design, Tolerancing and Manufacturing

Development of a methodology for evaluating the process window of ductile machining for brittle-hard materials

Oliver Faehnle1, Thomas Liebrich2, Henrik Surberg1

1OST – Ostschweizer Fachhochschule, Switzerland; 2Rhysearch

This paper presents a standardized methodology for determining the process window for ductile machining of brittle materials. Its application for CaF2 is reported, identifying an optimized process window for single-point diamond turning on UPM machines by determining optimized process parameters.

2:30pm - 4:00pmTOM5 S02: Resonant Nanophotonics
Location: B120
Session Chair: Sara Nunez Sanchez, University of Vigo, Spain
2:30pm - 3:00pm
ID: 368 / TOM5 S02: 1
TOM 5 Resonant Nanophotonics


Aitzol Garcia Etxarri

Donostia International Physics Cente, Spain


3:00pm - 3:15pm
ID: 145 / TOM5 S02: 2
TOM 5 Resonant Nanophotonics

Dynamics of the optical forces in nanosystems

Andrei Kiselev, Karim Achouri, Olivier J. F. Martin

Swiss Federal Institute of Technology Lausanne (EPFL), Switzerland

We investigate optical forces in the time domain, instead of using the time-average Maxwell stress tensor. We demonstrate first that a plane wave causes on a physical object an optical pressure that fluctuates at optical frequency in the time domain. The analytical formula for the optical force dynamics is presented for this case. The case for two-wave illumination with slightly different frequencies is considered next. It is shown that in this case the optical force acquires a component at the beating frequency. The analytical expression for the transient force is deduced and its relation with average force explained in detail.

3:15pm - 3:30pm
ID: 224 / TOM5 S02: 3
TOM 5 Resonant Nanophotonics

Nanohybrid architectures for strong light-matter interaction

Marzia Ferrera1, Vicenzo Aglieri1, Jacopo Stefano Pelli Cresi1, Remo Proietti Zaccaria1, Luca Razzari2, Andrea Toma1

1Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy; 2INRS Énergie, Matériaux et Télécommunications, 1650 Blvd Lionel Boulet, J3X 1S2 Varennes, QC, Canada

The investigation of strong light-matter interactions in nanohybrid architectures is promising for both fundamental studies and novel technological applications. In particular, the properties of low-dimensional semiconducting materials can be properly tailored via their integration with optical nanocavities, with strong implications on the final device performance. Here we present two main experiments, in which we exploit ad-hoc designed photonic nanoarchitectures to reshape, respectively, the exciton and phonon energy landscapes of quantum dots. Our results are stimulating towards further explorations of the physics of strongly coupled hybrid systems which present potential interest in several fields, spanning from photocatalysis to optoelectronic and quantum technologies.

3:30pm - 3:45pm
ID: 244 / TOM5 S02: 4
TOM 5 Resonant Nanophotonics

Numerical investigation of far-field circular dichroism and local chiral response of pseudo-chiral meta-surface with FEM

Jayeeta Amboli1, Guillaume Demesy1, Bruno Galas2, Nicolas Bonod1

1Institute Fresnel, Aix-Marseille University, France; 2Institut des NanoSciences de Paris, Sorbonne Universités, UPMC Univ Paris 06,France

Circular dichroism spectroscopy is a sensitive and widely applied technique to detect chiral molecules. Recent studies have shown high prospects for plasmonic metasurfaces of pseudo-chiral nano-resonators in enhancing chiral sensitivity. Here we study the far-field circular dichroism for gold U-shaped metasurfaces by calculating Mueller matrix elements with the Finite element method and investigate its response in light of the near field electric energy and optical chiral density.

2:30pm - 4:00pmTOM6 S01: Optical Materials: crystals, thin films, organic molecules and polymers, syntheses, characterization and devices: Optical materials, structuring and applications
Location: B324
2:30pm - 3:00pm
ID: 268 / TOM6 S01: 1
TOM 6 Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and devices

Laser micromachining of diamond: A viable photonic and optofluidic platform

Ottavia Jedrkiewicz1, Akhil Kuriakose1,2, Argyri N Giakoumaki3, Giulio Coccia3,4, Monica Bollani3, Roberta Ramponi3,4, Shane M Eaton3

1IFN-CNR, Como, Italy; 2University of Insubria, Como, Italy; 3IFN-CNR, Milano, Italy; 4Politecnico di Milano, Italy

We describe how the ultrafast laser micromachining technique applied with different writing methods can be used for the creation of various building blocks essential for the realization of a photonic and optofluidic diamond platform. Waveguides, NV centers, conductive wires, microchannels and microholes can be obtained thanks to laser microfabrication with suitable pulse parameters, making use not only of standard Gaussian laser beams but also of non-diffracting Bessel beams, the latter especially in all those cases where single pass high aspect-ratio microstructures or ablated areas are needed.

3:00pm - 3:15pm
ID: 248 / TOM6 S01: 2
TOM 6 Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and devices

Flexible all-glass planar structured fabricated by RF-sputtering

Alice Carlotto1,2, Osman Sayginer3, Anna Szczurek1, Lam T. N. Tran1,4,5, Rossana Dell’Anna6, Stefano Varas1, Bartosz Babiarczuk7, Justyna Krzak7, Oreste S. Bursi8, Daniele Zonta8, Anna Lukowiak9, Giancarlo C. Righini10, Maurizio Ferrari1, Silvia Maria Pietralunga2, Alessandro Chiasera1

1IFN-CNR, CSMFO Lab. and FBK Photonics Unit, Via alla Cascata 56/C, Povo, 38123 Trento, Italy; 2IFN-CNR, P.zza Leonardo da Vinci 32, 20133 Milan, Italy; 3Chair of Biological Imaging and TranslaTUM, Technische Universität München, Ismaninger Str. 22, D-81675 Munich, Germany; 4Dept. of Physics, Politecnico di Milano, P.zza L. da Vinci 32, 20133 Milan, Italy; 5Dept. of Materials Technology, Faculty of Applied Sciences, Ho Chi Minh City University of Technology and Education, Vo Van Ngan Str. 1, Thu Duc District, 720214 Ho Chi Minh City, Vietnam; 6Center for Sensors and Devices, Micro Nano Facility, Fondazione Bruno Kessler, Via Sommarive 18, Povo, 38123, Trento, Italy; 7Dept. of Mechanics, Materials and Biomedical Engineering, Wroclaw University of Science and Technology, Smoluchowskiego 25, 50-370 Wroclaw, Poland; 8Dept. of Civil, Environmental and Mechanical Engineering, University of Trento, via Mesiano 77, 38123 Trento, Italy; 9Institute of Low Temperature and Structure Research, PAS, ul. Okólna 2, 50422, Wroclaw, Poland; 10IFAC-CNR, MiPLab, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy, France

Flexible SiO2/HfO2 1D photonic crystals and active SiO2–HfO2:Er3+ all-glass flexible planar waveguides fabricated by radio frequency sputtering, are presented. The 1D photonic crystals show a strong dependence of the optical features on the light incident angle: i) blue-shift of the stopband and ii) narrowing of the reflectance window. Nevertheless, the most interesting result is the experimental evidence that, even after the 1D photonic crystals breakage, where the flexible glass shows naked-eye visible cracks, the multilayer structures generally maintain their integrity, resulting to be promising systems for flexible photonic applications thanks to their optical, thermal and mechanical stability. The flexible planar waveguides, fabricated on ultrathin flexible glass substrate, showed an attenuation coefficient lower than 0.2 dB/cm at 1.54 μm, and exibits emission in the NIR region, resulting particularly suitable as waveguide amplifier in the C band of telecommunications.

3:15pm - 3:30pm
ID: 170 / TOM6 S01: 3
TOM 6 Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and devices

One-dimensional photonic crystal for polarization-sensitive surface-enhanced spectroscopy

Erika Mogni1, Giovanni Pellegrini2, Jorge Gil-Rostra3, Francisco Yubero3, Giuseppina Simone1,4, Stefan Fossati5, Jakub Dostalek5,6, Rebeca Martinez-Vazquez7, Roberto Osellame7, Michele Celebrano1, Marco Finazzi1, Paolo Biagioni1

1Politecnico di Milano, Dipartimento di Fisica, Milano, Italy; 2Università degli studi di Pavia, Dipartimento di Fisica, Pavia, Italy; 3CSIC-Universidad de Sevilla, Instituto de Ciencia de Materiales de Sevilla, Sevilla, Spain; 4Northwestern Polytechnical University, School of Mechanical Engineering, Xi'an Shaanxi, People's Republic of China; 5AIT Austrian Institute of Technology GmbH, Biosensor Technologies, Tulln an der Donau, Austria; 6Czech Academy of Sciences, FZU-Institute of Physics, Prague, Czech Republic; 7Istituto di Fotonica e Nanotecnologie (IFN)-CNR, Milano, Italy

We realize and experimentally characterize a novel platform for surface-enhanced sensing through Bloch Surface Waves (BSWs). We test a one-dimensional photonic crystal, with a high index inclusion in the top layer, that sustains surfaces modes with, in principle, arbitrary polarization. This is achieved through the coherent superposition of TE and TM dispersion relations of BSWs, which can also provide superchiral fields over a wide spectral range (down to the UV). The resulting platform paves the way to the implementation of polarization-resolved surface-enhanced techniques.

3:30pm - 3:45pm
ID: 222 / TOM6 S01: 4
TOM 6 Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and devices

The role of heat treatment in improving photoluminescence and optically stimulated luminescence of HfO2

Alvaro de Farias Soares1,2, Sonia Hatsue Tatumi2,3, Clemens Woda1, Lilia Coronato Courrol4

1Helmholtz Zentrum München, Germany; 2Escola Politécnica, Universidade de São Paulo, Brasil; 3Instituto do Mar, Universidade Federal de São Paulo, Brasil; 4Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Brasil

HfO2 is a metal oxide from the IV-B family whose properties have been widely applied in electronics and which displays an important blue emission. Despite this fact, few studies have been dedicated to understanding the role of heat treatment on its luminescence properties. Therefore, this study aimed to investigate the Photoluminescence (PL) and Optically Stimulated Luminescence (OSL) of HfO2 powder synthesized by the precipitation method and the influence of calcination on its luminescence. PL spectra results showed a broad emission band at about 2.6 eV, which was related to absorption at 4.1 eV. Green and blue stimulated luminescence spectra depicted emission bands in a similar region, varying between 2.44 up to 2.71 eV. The increase in the heat treatment temperature promoted signal enhancement, which could be associated with higher oxygen vacancy concentrations. OSL dose-response curves for the sample calcined at 1600 °C are linear up to 0.6 Gy and a good signal reproducibility is observed, which makes the material suitable for OSL dosimetry.

2:30pm - 4:00pmTOM8 S02: Nonlinear and Quantum Optics 2
Location: B328
Session Chair: Sile Nic Chormaic, OIST Graduate University, Japan
2:30pm - 3:00pm
ID: 162 / TOM8 S02: 1
TOM 8 Non-linear and Quantum Optics

Superfluid light through dissipation

Giel Keijsers1, Torben Ham1, Zhou Geng1, Kevin J. H. Peters1, Michiel Wouters2, Said R. K. Rodriguez1

1AMOLF, Amsterdam, the Netherlands; 2Universiteit Antwerpen, Antwerp, Belgium

Light in a nonlinear cavity is expected to flow without friction - like a superfluid - under certain conditions. Until now, part-light part-matter (i.e., polariton) superfluids have been observed either at liquid helium temperatures in steady state, or at room temperature for sub-picosecond timescales. Here we report superfluid cavity photons (not polaritons) for the first time. When launching a photon fluid against a defect, we observe a suppression of backscattering above a critical density and below a critical velocity. Room-temperature and steady-state photon superfluidity emerges thanks to the strong thermo-optical nonlinearity of our oil-filled cavity. Surprisingly, dissipationless superfluid flow is achieved by absorptive dissipation inducing the thermal nonlinearity. We also show how the thermal relaxation of the oil sets the timescale at which superfluidity emerges. Our experimental observations are reproduced qualitatively by numerical calculations based on a generalized Gross-Pitaevskii equation for photons coupled to a thermal field. The interpretation of superfluid photons is further substantiated by phase dislocations appearing in the wake of a defect at the breakdown of superfluidity. Our results establish thermo-optical nonlinear cavities as platforms for probing photon superfluidity at room temperature, and offer perspectives for exploring superfluidity in arbitrary potential landscapes using structured mirrors.

3:00pm - 3:30pm
ID: 115 / TOM8 S02: 2
TOM 8 Non-linear and Quantum Optics

Quantum vacuum excitation of a quasi-normal mode in an analog model of black hole spacetime

Maxime Jacquet

CNRS, France

Vacuum quantum fluctuations near horizons are known to yield correlated emission by the Hawking effect. In this talk, I will explain how a 1 dimensional flow of microcavity polaritons may be engineered to produce an effective curved spacetime with a black hole horizon. I will present numerical computations of correlated emission on this spacetime and show that, in addition to the Hawking effect at the sonic horizon, quantum fluctuations may result in a sizeable stationary excitation of a quasi-normal mode of the field theory. Observable signatures of the excitation of the quasi-normal mode are found in the spatial density fluctuations as well as in the spectrum of Hawking emission. I will explain how the driven-dissipative dynamics of the polariton fluid are key to observing the quantum excitation of the quasi-normal mode. Nonetheless, this observation suggests a general and intrinsic fluctuation-driven mechanism leading to the quantum excitation of quasi-normal modes on black hole spacetimes.

3:30pm - 3:45pm
ID: 116 / TOM8 S02: 3
TOM 8 Non-linear and Quantum Optics

Paraxial quantum fluids light in hot atomic vapors

Murad Abuzarli, Tangui Aladjidi, Nicolas Cherroret, Quentin Glorieux

LKB, France

Hot atomic vapors are widely used in non-linear and quantum optics due to their large Kerr non-linearity. This non-linearity induces effective photon-photon interactions allowing light to behave as a fluid displaying quantum properties such as superfluidity. In this presentation, I will show that we have full control over the Hamiltonian that drives the system and that we can engineer an analogue simulator with light.

3:45pm - 4:00pm
ID: 394 / TOM8 S02: 4
Post Deadline submission

Photonic Maxwell's demon: feed-forward methods for photonic thermodynamic tasks

Maxime Jacquet

Laboratoire Kastler Brossel, CNRS, France

Maxwell's Demon is at the heart of the interrelation between quantum information processing and thermodynamics. In this thought experiment, a demon extracts work from two thermal baths at equilibrium by gaining information about them at the single-particle level and applying classical feed-forward operations.

In this talk I will show how to implement a photonic version of Maxwell's Demon with active feed-forward in a fiber-based system using ultrafast optical switches.

This is the first realisation of an active Demon.

The experiment shows that, if correlations exist between the two thermal baths, the Demon can extract over an order of magnitude more work than without correlations.

This demonstrates the great potential of photonic experiments -- which provide a unique degree of control on the system -- to access new regimes in quantum thermodynamics.

2:30pm - 4:00pmTOM9 S05: Opto-electronic Nanotechnologies and Complex Systems: Nanostructures
Location: B231
Session Chair: Concita Sibilia, Università di Roma La Sapienza, Italy
2:30pm - 3:00pm
ID: 349 / TOM9 S05: 1
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Nanostructured films of two-dimensional materials: electronic transport, electronic devices and wearable electronics

Felice Torrisi

Imperial College London/Universita' di Catania, United Kingdom

Wearable electronics is a primary technology to enable remote healthcare provision, which is highly important in a post-pandemic society. Graphene and related 2D materials (GRMs) hold a great potential for wearable electronics for their novel electrical and optical properties.

3:00pm - 3:15pm
ID: 221 / TOM9 S05: 2
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Active tuning of the optical response of field-effect-gated transparent conductive oxides

Maria Sygletou1, Emilio Bellingeri2, Maurizio Canepa1, Francesco Bisio2

1OPTMATLAB Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy; 2CNR-SPIN, Corso F.M. Perrone 24, 16152 Genova, Italy

Transparent Conductive Oxides (TCOs) are a class of materials with high optical transparency and electrical conductivity. This combination makes them extremely appealing for solar cells, optoelectronics and infrared-plasmonics applications. In this work, we report the active tuning of the optical response of aluminium-doped ZnO (AZO) films upon electrical gating within a parallel-plate capacitor configuration. We investigated the electrical-bias-dependent optical response of thin AZO films fabricated by pulsed laser deposition by means of spectroscopic ellipsometry (SE). Calculations based on an exponentially-decaying spatial distribution of injected/depleted charge density in the AZO film are in accordance with experimental observations, allowing the extraction of the Debye length.

3:15pm - 3:45pm
ID: 391 / TOM9 S05: 3
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Ultrasensitive PCR and label-free optical biosensors based on photonics transduction

Sabrina Conoci

Università di Messina, Italy

The molecular analysis of Nucleic Acids (NA), DNA and RNA, has become nowadays crucial in many medical fields for early and accurate diagnosis, personalized therapy and preventive screening. It is particularly relevant in the field of the infectious diseases that can catastrophically affect the health of population, as it is the case of the current pandemics due to the SARS-CoV-2 virus that – up to now – infected up to 434 millions of people causing 6 millions of deaths worldwide. Currently, the molecular analysis of NA is based on PCR (Polymerase Chain Reaction) method, that however includes complex procedures (sample preparation and detection); this limits, de facto, its use for massive screening. In this contribution, two PCR- free innovative approaches using photonics transduction are presented and discussed. Both approaches are based on the capture of whole genomes of pathogens at inorganic surface (silicon or electrode surface) through cooperative hybridization with two complementary capture probes (single strand DNA or RNA) immobilized on this surface.

4:00pm - 4:30pmCoffee Break - Visit the Exhibition
Location: Lunch & Coffee Tent
4:30pm - 6:00pmTOM1 S04: Silicon Photonics and Guided-Wave Optics
Location: B116
Session Chair: Andrea Melloni, Politecnico di Milano, Italy
4:30pm - 5:00pm
ID: 310 / TOM1 S04: 1
TOM 1 Silicon Photonics and Guided-Wave Optics

Multi-objective design of photonic devices and metamaterials

Daniele Melati

Université Paris-Saclay, France

High performance and large-scale integration are driving the design of innovative photonic devices based on non-trivial shapes and metamaterials. In this scenario, multiple figures of merit must necessarily be considered in the evaluation of the device performance, e.g., losses, bandwidth, footprint, or tolerance to fabrication uncertainty. In this invited talk we will present our recent work on the use of machine learning and optimization tools for the development of photonic components with high performance and advanced functionalities.

5:00pm - 5:30pm
ID: 153 / TOM1 S04: 2
TOM 1 Silicon Photonics and Guided-Wave Optics

Ultra-dense interferometric chain architecture for datacom and telecom applications

Serge Bidnyk, Ksenia Yadav, Ashok Balakarishnan

Enablence Technologies Inc., Canada

Further increase in the density of integrated planar lightwave circuits (PLCs) depends on the introduction of compact guided-wave layout solutions. We describe a novel architecture for coiling multistage interferometric devices with densities reaching the theoretical limit. Our approach is validated by the design, fabrication, and deployment of state-of-the-art PLCs based on the proposed architecture for use in datacom and telecom applications.

5:30pm - 5:45pm
ID: 319 / TOM1 S04: 3
TOM 1 Silicon Photonics and Guided-Wave Optics

Ultra-low-loss silicon nitride waveguide for supercontinuum generation

Yijun Yang1, Christian Lafforgue1, Quentin Wilmart2, Thibaut Sylvestre3, Sylvain Guerber2, Xavier Le Roux1, Eric Cassan1, Delphine Marris-Morini1, Carlos Alonso-Ramos1, Bertrand Szelag2, Laurent Vivien1

1Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies (C2N),91120 Palaiseau, France; 2Univ. Grenoble Alpes, CEA, LETI, Grenoble, 38000, France; 3Institut FEMTO-ST, Université Bourgogne Franche-Comté CNRS UMR 6174, 25000, Besançon, France

In this paper, we present the generation of supercontinuum in ultra-low loss silicon nitride waveguides fabricated in 200mm wafer. The waveguide was pumped at its maximum group velocity dispersion(GVD) wavelength. Both experimental and simulation results are presented and compared. We observed a rather flat and symmetric spectrum expansion over 1.3 octave from visible to near IR wavelength range with a pump pulse energy lower than 65pJ.

5:45pm - 6:00pm
ID: 211 / TOM1 S04: 4
TOM 1 Silicon Photonics and Guided-Wave Optics

III-V Compound Semiconductor Membrane Quantum Well Waveguide Lasers emitting at 1 μm

Stephen C. Richardson1, Jonathan R. C. Woods2, Jake Daykin1, Jon Gorecki3, Roman Bek4, Nicholas T. Klokkou1, James S. Wilkinson5, Michael Jetter6, Vasileios Apostolopoulos1

1School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ; 2Aquark Technologies, Abbey Enterprise Centre Premier Way, Abbey Park Industrial Estate, Romsey, SO51 9AQ; 3School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, E1 4NS; 4Twenty-One Semiconductors GmbH, Kiefernweg 4, 72654 Neckartenzlingen, Germany; 5Zepler Institute, University of Southampton, Southampton, SO17 1BJ; 6Institute for Semiconductor Optics and Functional Interfaces, University of Stuttgart, 70569 Stuttgart, Germany

We demonstrate epitaxially grown semiconductor membrane quantum well lasers on a SiO2/Si substrate lasing in a waveguide configuration, for potential uses as coherent light sources compatible with photonic integrated circuits. We study the emission characteristics of In0.13Ga0.87As/GaAs0.94P0.06 quantum well lasers, by using real and reciprocal space imaging. The laser cavity length is 424 μm, it emits light at 1 μm, and lasing thresholds as low as 211 mW were recorded. Control over the position and size of the laser spots by the pump was also observed and demonstrated.

4:30pm - 6:00pmTOM10 S02: Frontiers in Optical Metrology: Interferometry
Location: B031
Session Chair: Ralf B. Bergmann, BIAS, Germany
4:30pm - 5:00pm
ID: 305 / TOM10 S02: 1
TOM 10 Frontiers in Optical Metrology

Toward tomography imaging of acoustic fields using digital holography

Pascal Picart, Saoucene Hassad

Le Mans University, France

The characterization and control of waves in acoustics, and more generally in wave physics, is of great interest because resulting technological innovations may impact several domains: environmental and energy transition, health sector, and industrial sector in the broadest sense. The characterization requires to develop new approaches to provide qualitative and quantitative insight of the acoustic fields of interest. Generally, imaging acoustic fields is performed by using microphone arrays which have a low spatial resolution. Here, we aim at demonstrating the proof-of-concept of simultaneous full-field and multi-view imaging of acoustic field in the free space using digital color holography and a single monochromatic high-speed sensor. The simultaneous acquisition of the necessary set of data is thus realized "single shot" and then numerical process yields images of both the amplitude and phase of the acoustic field along three different directions of observation. This has for advantage of permitting consistent and rapid data acquisition. We present the first experimental results and the first tomographic reconstruction of an acoustic field propagating in the free-field at 40 k Hz.

5:00pm - 5:15pm
ID: 183 / TOM10 S02: 2
TOM 10 Frontiers in Optical Metrology

Investigation of dynamic influences in tilted-wave interferometry

Gregor Scholz, Michael Schulz, Ines Fortmeier

Physikalisch-Technische Bundesanstalt (PTB), Germany

Aspherical and freeform lenses allow for compact optical systems and have therefore gained high interest in optics. The interferometric measurement of these forms is a challenge, for which the tilted-wave interferometer (TWI) has been developed. To evaluate the measurement uncertainty of the TWI, both the static and the dynamic influence parameters have to be investigated. In this work, we focus on the dynamic influences on the measurement data of the interferometer. To this end, the individual influences as well as their point of insertion into the process chain are identified. Then the measurement of the interferogram data is modelled as a Monte Carlo simulation. The propagation of different influences through the data process chain to the optical path length differences (OPDs) is also simulated, and the resulting variation of the OPDs is estimated. Furthermore, the variation of the OPDs resulting from measured interferogram data is investigated for comparison. The analysis and quantification of variation of the OPDs along with its contributing influence sources are important steps on the way towards a full uncertainty estimation of optical form measurement with the TWI.

5:15pm - 5:30pm
ID: 290 / TOM10 S02: 3
TOM 10 Frontiers in Optical Metrology

Quasi-analytical and rigorous modeling of interference microscopy

Tobias Pahl, Johannes Breidenbach, Peter Lehmann

University of Kassel, Germany

We present an extended vectorial Kirchhoff model of coherence scanning interferometry including several vector rotations occurring in the imagining and scattering process as well as polarization dependent reflection coefficients. For validation simulated results are compared to those of the conventional scalar Kirchhoff model and a rigorous finite element modeling.

5:30pm - 5:45pm
ID: 289 / TOM10 S02: 4
TOM 10 Frontiers in Optical Metrology

Low divergence structured beam In view of precise long-range alignment

Miroslav Sulc1,2, Jean-Christophe Gayde3

1Technical University of Liberec, Czech Republic; 2Institute of Plasma Physics of the Czech Academy of Sciences, Czech Republic; 3CERN, Switzerland

A new method of generation of a Structured Laser Beam (SLB) with non-diverging central core was proposed and is promising for creating long distance multipoint alignment systems. This beam is generated by a set-up consisting of two convex lenses in Kepler telescope arrangement. The first one is a high refractive index ball lens, second one is a standard lens. The beam, in cross-section consisting of light and dark concentric circles, propagates over a large distance. The central core of the SLB has a very small divergence which can be tuned. A divergence of 10 μrad was proven experimentally. In this experiment, the small initial beam core diameter of 10 μm, and its diameter of 1.5 mm at a distance of 150 m, show its ability for use as a multipoint fiducial reference line. This small beam divergence seemingly lies beyond the diffraction limit for laser beams.

5:45pm - 6:00pm
ID: 393 / TOM10 S02: 5
TOM 10 Frontiers in Optical Metrology

Holographic single-image depth reconstruction

Simon Hartlieb, Christian Schober, Tobias Haist, Stephan Reichelt

Institut für Technische Optik, Universität Stuttgart, Germany

In this article a camera-based single-image sensor is presented, that is able to measure the distance of multiple object points. The experimental results show an accuracy of 8,51 µm within a depth range of 20 mm. The sensor consists of a camera, whose lens is upgraded with a diffractive optical element (DOE). It fulfils two tasks: adding a vortex point spread function (PSF) and replication of the vortex PSFs to a predefined pattern of K spots. Both, shape and rotation of the vortex PSF is sensitive to defocus. By applying the depth reconstruction to each of the K replications and averaging the results, we experimentally show, that the reconstruction of the depth signal can be improved by a factor of up to 3.

4:30pm - 6:00pmTOM13 S06: Advances and Applications of Optics and Photonics
Location: B035
Session Chair: Orlando Frazão, Physics, Portugal
4:30pm - 4:45pm
ID: 269 / TOM13 S06: 1
TOM 13 Advances and Applications of Optics and Photonics

Multi-well platform manufacturing combining stereolithography and pulsed laser ablation for cellular studies

Bastián Carnero1,2, Carmen Bao-Varela1, Ana I. Gómez-Varela1, Ezequiel Álvarez3,4,5, M. Teresa Flores-Arias1

1Photonics4Life research group, Departmento de Física Aplicada, Facultade de Física and Instituto de Materiais (iMATUS), Universidade de Santiago de Compostela; 2BFlow S.L.; 3Departamento de Farmacoloxía, Farmacia e Tecnoloxía Farmacéutica, Universidade de Santiago de Compostela; 4Instituto de Investigación Sanitaria de Santiago de Compostela (IDIS); Fundación IDIS, SERGAS; 5CIBERCV

Novel cell culture platforms, with more physiological surface roughness, require different technologies capable of precisely micropattern substrates. 3D printing offers a considerable accuracy and user-friendly procedures. For its part, pulsed laser ablation proves to be a versatile technology to perform detailed surface micropatterning. In this work, both technologies were combined to easily fabricate a versatile PDMS multi-well platform for performing cellular studies on a micropatterned biocompatible surface.

4:45pm - 5:00pm
ID: 260 / TOM13 S06: 2
TOM 13 Advances and Applications of Optics and Photonics

Celebrating a face-to-face congress of young researchers in Optics after the pandemic years: the I NW MYRO

Bastián Carnero1, Alba de las Heras2, Alejandro Doval1, Alex Martín-Rodríguez2, Alicia Muñoz-Ramos1, Ana García-Cabrera2, C. Damián Rodríguez-Fernández1, Damián Insua-Costa1, Irene Romo-Díez1, Isabel Rodríguez-Pérez2, Javier Prada-Rodrigo2, Javier Varela-Carballo1, José Paz-Martín1, María Sánche-Hernández2, M. Jesús Martínez-Morillo2, Mario Guerras-Rodríguez2, Millán Pérez2, Sabela Fernández-Rodicio1, Verónica Villa-Ortega1, Víctor W. Segundo-Staels2, M. Teresa Flores-Arias1

1Dissemination Group and Students Association LUZADA, USC-OPTICA Student Chapter and Santiago USC Young Minds Section; 2OSAL Student Chapter

This contribution reports the organization and celebration after the Covid-19 pandemic of a singular scientific conference focused on early-career researchers from the Spanish universities of Santiago de Compostela and Salamanca: the “I Northwest Meeting of Young Researchers in Optics (I NW MYRO)”.

5:00pm - 5:15pm
ID: 155 / TOM13 S06: 3
TOM 13 Advances and Applications of Optics and Photonics

Fluorescence for non-contact detection of salmon lice in fish farms

Kari Anne Hestnes Bakke, Jon Tschudi, Trine Kirkhus

SINTEF, Norway

This work presents a promising method for automatic non-contact detection and counting of salmon lice infested on salmon in an aquacultural farm setting. The method uses fluorescence in the visual part of spectrum to enhance the contrast between fish skin and lice. The wavelengths used are compatible with an underwater measurement system.

5:15pm - 5:30pm
ID: 139 / TOM13 S06: 4
TOM 13 Advances and Applications of Optics and Photonics

Imaging of water samples for the detection and identification of microplastics

Matthieu Roussey1, Boniphace Kanyathare1, Blaž Hrovat2, Nikolaos Papamatthaiakis3, Joni Hattuniemi4, Benjamin O. Asamoah1, Antti Haapala3, Arto Koistinen2, Kai-Erik Peiponen1

1Department of Physics and Mathematics, Institute of Photonics, University of Eastern Finland, P.O. Box 111, 80101 Joensuu, Finland; 2SIB Labs, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland; 3School of Forest Sciences, University of Eastern Finland, PO Box 111, 80101 Joensuu, Finland; 4Valmet Automation Inc., Kehräämöntie 3, 87400 Kajaani, Finland

We demonstrate that direct imaging is a powerful tool for the detection and recognition of microplastics in water, even in case of complex matrices. We use a commercial high-resolution imagining device (FS5, Valmet Oy.) originally developed for the observation of wood fibres in papermill water systems. We show how to discriminate microplastics from other particles in suspension in real water samples. We show differences between several common plastic types in homemade samples.

5:30pm - 5:45pm
ID: 250 / TOM13 S06: 5
TOM 13 Advances and Applications of Optics and Photonics

Quadrics for structuring invariant space-time wave packets

Pierre Béjot, Bertrand Kibler

Laboratoire ICB - CNRS, France

We provide a general approach for structuring invariant 3D+1 optical wave packets in both bulk and structured dispersive media, through a simple engineering of phase-matched space-time frequencies on quadric surfaces.

5:45pm - 6:00pm
ID: 306 / TOM13 S06: 6
TOM 13 Advances and Applications of Optics and Photonics

Plug and play colorimetric carbon dioxide sensor

Nuno alexandre Mendes1,2, João Pedro Mendes2,3, Pedro Alberto Jorge1,2, Luís Carlos Coelho1,2

1Department of Physics and Astronomy, Faculty of Sciences of University of Porto; 2INESC TEC – Institute for Systems and Computer Engineering, Technology and Science, and Faculty of Sciences of University of Porto; 3Chemistry Research Unit – Chemistry and Biochemistry Department, Faculty of Sciences of University of Porto

Carbon dioxide measurement is an important endeavor in many industries such as food packaging, grain storage and health industry. This work presents a reversible, plug and play and low-cost colorimetric CO2 sensor calibrated in a proper concentration ranging from 1% to 3% of CO2. The sensor showed potential for improvement to increase resolution, for measuring lower CO2 concentrations and for more accurate readings.

6:00pm - 6:15pm
ID: 245 / TOM13 S06: 7
TOM 13 Advances and Applications of Optics and Photonics

Automation strategies and machine learning algorithms towards real-time identification of optically trapped particles

João Miguel Oliveira1,2, Vicente Vieira Rocha1,2, Nuno A. Silva1,2, Pedro A. S. Jorge1,2

1INESC, Portugal; 2Dep. de Física e Astronomia da Universidade do Porto

To automatically trap, manipulate and probe physical properties of micron-sized particles is a step of paramount importance for the development of intelligent and integrated optomicrofluidic devices. In this work, we aim at

implementing an automatic classifier of micro-particles immersed in a fluid based on the concept of optical tweezers. We describe the automation steps of an experimental setup together with the implemented classification models using the forward scattered signal. The results show satisfactory accuracy around 80% for the identification of the type and size of particles using signals of 250 milliseconds of duration, which paves the path for future improvements towards real-time analysis of the trapped specimens.

4:30pm - 6:00pmTOM3 S06: Optical System Design, Tolerancing and Manufacturing
Location: B032
Session Chair: Jens Bliedtner, Ernst-Abbe-Uiversity of Applied Sciences Jena, Germany
4:30pm - 5:00pm
ID: 351 / TOM3 S06: 1
TOM 3 Optical System Design, Tolerancing and Manufacturing

Development of an aluminium reflecting telescope for small satellite

Okiharu Kirino

Crystal Optics Inc., Japan

A finishing technique by direct polishing of aluminium was investigated for low-cost manufacturing of reflecting telescopes for small satellites, the number of which is expected to increase in the future. By MRF polishing of aluminium alloy manufactured by the rapid solidification method, it was possible to achieve an ultra-precise finish equivalent to that of glass, with a surface roughness of about 1 nm Sa and a form accuracy of 100 nm PV or less.

5:00pm - 5:15pm
ID: 285 / TOM3 S06: 2
TOM 3 Optical System Design, Tolerancing and Manufacturing

Light Scattering from Contamination and Defects – Measurement, Analysis, and Modelling

Tobias Herffurth1, Alexander Bergner1,2, Sven Schröder1, Marcus Trost1

1Fraunhofer IOF, Germany; 2Institute of Applied Physics, FSU Jena, Germany

Light scattering induced by contamination and defects on optical components can quickly limit the component’s performance. Therefore, imperfection analysis and budgeting are mandatory - but also challenging tasks. On the other hand, imperfections can be elegantly characterized using efficient, robust and non-contact light scattering techniques. This will be demonstrated in this contribution for area covering measurement approaches using laboratory instruments with highest sensitivity as well as elaborated sensor systems that are best suited for extended freeform surfaces. Moreover, the measurement results are used to derive practical imperfection scattering data and models that serve as input to model and predict the imperfection induced scattering on optical system level.

5:15pm - 5:45pm
ID: 350 / TOM3 S06: 3
TOM 3 Optical System Design, Tolerancing and Manufacturing

Automated detection of scratch and dig on optical surfaces

Jean-Michel Asfour

DIOPTIC GmbH, Germany

The optical industry in Germany is closely associated with names such as Ernst Leitz, Moritz Hensoldt and Oskar Barnack, all of whom started their success stories as craft businesses in Wetzlar about 150 years ago. Manufacturing was and still is dominated by craftsmanship, as is the associated quality inspection and metrology. An important step here is the inspection of optical surfaces for cosmetic defects, an activity that is still predominantly performed visually by hand today. We demonstrate the challenges that an automated solution must meet and present a machine inspection solution that fulfils the requirements of the ISO standard and is superior to a manual visual inspection in terms of measurement uncertainty and costs. The system allows integration into a modern manufacturing environment, with the possibility to collect statistics of defect classes and thus optimize manufacturing processes, as well as the connection of the measured data to production databases.

5:45pm - 6:00pm
ID: 336 / TOM3 S06: 4
TOM 3 Optical System Design, Tolerancing and Manufacturing

Investigations on the production of optical freeforms applying the advanced wheel polishing process

Sebastian Stoebenau1, Igor Morozov1, Rafael Hild1, Sebastian Henkel2, Christian Schulze2, Christoph Letsch2, Samson Frank2, Jens Bliedtner2

1OptoTech Optikmaschinen GmbH, Germany; 2Ernst-Abbe University of Applied Sciences Jena, Germany

The growing interest in providing additional degrees of freedom to the design of high-end optical systems has led to an increased demand for freeform optical elements. The efficient fabrication of such elements requires a polishing process that provides high removal rates and a stable removal function while working with a relatively small spot size. Taking these constraints into consideration this paper focusses on the successful implementation of polishing processes applying the A-WPT (Advanced Wheel Polishing Tool) technology. Addressing the requirements regarding its removal characteristics as mentioned before, it represents an appropriate choice for providing an efficient pre-polishing as well as corrective polishing technique. In order to maintain perpendicularity towards the freeform surface to be polished, the A-WPT is run on a 5-axis simultaneous machining system. First investigations of the achieved surface accuracy after pre-polishing were carried out as well as an assessment of residual surface features within different spatial frequency regions. In addition, the polished surface is being checked for remaining SSD using an OCT technique.

4:30pm - 6:00pmTOM5 S03: Resonant Nanophotonics
Location: B120
Session Chair: Costanza Toninelli, CNR-INO, Italy
4:30pm - 5:00pm
ID: 369 / TOM5 S03: 1
TOM 5 Resonant Nanophotonics


Humeyra Caglayan

Tampere University, Finland


5:00pm - 5:15pm
ID: 263 / TOM5 S03: 2
TOM 5 Resonant Nanophotonics

Controlling resonant surface modes by arbitrary light induced optical anisotropies

Niccolo' Marcucci1, Giorgio Zambito2, Maria Caterina Giordano2, Francesco Buatier de Mongeot2, Emiliano Descrovi1

1Politecnico di Torino, Italy; 2University of Genoa, Italy

In this work the sensitivity of Bloch Surface Waves to laser-induced anisotropy of azo-polymeric thin layers is experimentally shown. The nanoscale reshaping of the films via thermal–Scanning Probe Lithography allows to couple light to circular photonic nanocavities, tailoring on-demand resonant BSW confined within the nanocavity.

5:15pm - 5:30pm
ID: 274 / TOM5 S03: 3
TOM 5 Resonant Nanophotonics

Approaches for the RCWA-based non-destructive characterization of subwavelength-structured gratings

Julian Wüster1, Andreas Reetz1, Rüdiger Schmidt-Grund2, Andrea Knauer3, Stefan Sinzinger1

1Fachgebiet Technische Optik, Technische Universität Ilmenau, Germany; 2Fachgebiet Technische Physik 1, Technische Universität Ilmenau, Germany; 3Institut für Mikro- und Nanotechnologien, Technische Universität Ilmenau, Germany

Nano-structuring enables us to add additional degrees of freedom to the design of optical elements. Especially the possibility of controlling the polarization is of great interest in the field of nano-structured optics. For being able to exploit the whole range of form-birefringent phase shifts, the aspect ratios of the resulting element are typically much higher than the aspect ratios of conventional diffractive optical elements (DOEs), which does not only pose a challenge on fabrication but also on characterization. We evaluate several well-established approaches for the nondestructive characterization, including Müller-Matrix-Ellipsometry, measurement

of the diffraction efficiencies, scattering measurements and calibration with rigorous coupled-wave modelling. The goal is to understand the challenges with all these techniques and combine them to a reliable method for structural reconnaisance of high aspect ratio nanostructures.

5:30pm - 6:00pm
ID: 371 / TOM5 S03: 4
TOM 5 Resonant Nanophotonics


Sebastien Bidault

Institut Langevin, ESPCI Paris, CNRS, France


4:30pm - 6:00pmTOM6 S02: Optical Materials: crystals, thin films, organic molecules and polymers, syntheses, characterization and devices: Optical materials, understanding and applications
Location: B324
Session Chair: Sebastien Montant, CEA CESTA, France
4:30pm - 5:00pm
ID: 340 / TOM6 S02: 1
TOM 6 Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and devices

Transparent wood – optical property understanding and tailoring

Yuanyuan LI

KTH Royal Institute of Technology, Sweden

Transparent wood (TW) is an emerging structural optical material with great potential in energy efficient buildings, opto-electronic devices, photonics, etc. It combines high optical transmittance with high haze. Due to the intrinsic anisotropic wood structure, the optical properties are anisotropic. Understanding the light interaction with TW is vital to tailor the optical properties for suitable applications. Therefore, in this work, light interaction with TW was studied. Based on the understanding, the optical properties could be manipulated.

5:00pm - 5:15pm
ID: 344 / TOM6 S02: 2
TOM 6 Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and devices

Terahertz helical antenna from vegetable celery

Carlito Jr Salonga Ponseca

Gulf University for Science and Technology, Kuwait

Next generation communication systems will almost certainly rely on higher frequency region of the electromagnetic waves, i.e., the terahertz (THz, 1012 Hz) regime. This is to accommodate the gargantuan data rates due to the ever-increasing appetite for text, voice, and video information. In this work, we present a potential THz antenna that can be produced with low cost and high production yield. By coating the helical structure of vegetable celery with organo-metallic poly(4-(2,3-dihydrothieno [3,4-b]-[1,4]dioxin-2-yl- methoxy)-1-butanesulfonate (PEDOT-S), an absorption band centered at 1.1 THz was observed. Several batches of celery antenna were prepared using different experimental conditions wherein shift in the THz absorption peak clearly manifested. Using ComsolTM Multiphysics simulation package, we attempted to understand these results.

5:15pm - 5:30pm
ID: 294 / TOM6 S02: 3
TOM 6 Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and devices

Janus cellulose switchable optics for solar-induced self-adaptive heating and evaporative drying

Subham Dastidar1,2, Md Mehebub Alam1,2, Xavier Crispin1,2, Dan Zhao1,2, Magnus P Jonsson1,2

1Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping, Östergötland, Sweden; 2Wallenberg Wood Science Center, Linköping University, Norrköping, Sweden

Note: Submission will be presented by Dr. Debashree Banerjee in place of Subham Dastidar.

Cellulose with its sustainable availability and ability to manage light interactions possesses immense potential for diverse applications in optics. While cellulose is inherently low-absorbing and its transparency can be tuned by microstructure, invoking optical dynamicity by reversible wetting with liquids, such as water, opens opportunities for wider range of applications. Here, we present a novel cellulose-based Janus structure that demonstrates solar-induced self-adaptive heating, and evaporative drying. The Janus structure is designed by overlaying a highly reflective (~90%) porous cellulose layer atop a strongly absorbing (>95%) cellulose-CNT layer. This ensures the Janus structure to remain highly reflective and non-absorptive at dry conditions. However, on wetting, the optical transparency of the porous layer increases and permits the absorptive bottom layer to access direct solar radiation. This enables the bottom layer to absorb solar light and generate heat, which is offset by endothermic water evaporation from the structure and eventually recovering to its dry reflective state. In-situ measurements of light scattering, temperature, and evaporative loss reveal an intriguing dynamic relationship between the optical properties of Janus structure and mechanism involved in the drying process.

5:30pm - 5:45pm
ID: 249 / TOM6 S02: 4
TOM 6 Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and devices

Polarized light guiding anisotropic deformation and relaxation in photosensitive polymeric substrates

David Urban1, Dag Roar Hjelme1, Emiliano Descrovi2

1Norges Teknisk-Naturvitenskapelige Universitet (NTNU), Norway; 2Politecnico di Torino (Polito), Italy

Light-responsive polymers offer unique possibilities for anisotropic manipulation of objects on the micron scale. Here we demonstrate the reversible anisotropic stretching of a polymeric surface made out of an azopolymer-elastomer blend, in response to green laser irradiation with varying polarization. We quantify the stretching parameters and the residual strain after relaxation by means of a Fourier-based analysis, which exploits a periodic 2D pattern imprinted onto the surface.

5:45pm - 6:00pm
ID: 280 / TOM6 S02: 5
TOM 6 Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and devices

Growth and mid-infrared emission properties of "mixed" fluorite-type Er:(Ca,Sr)F2 and Er:(Ba,Sr)F2 crystals

Liza Basyrova1, Pavel Loiko1, Abdelmjid Benayad1, Gurvan Brasse1, Jean-Louis Doualan1, Alain Braud1, Ammar Hideur2, Patrice Camy1

1Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252 CEA-CNRS-ENSICAEN, Université de Caen Normandie, France; 2UMR 6614, CNRS-INSA-Université de Rouen, Normandie Université, France

Fluorite-type 5 at.% Er3+:(M1,M2)F2 (M1 = Ca, Ba; M2 = Sr) crystals were grown by the conventional Bridgman technique and a comparative study of their spectroscopic properties was performed. The vibronic properties of the fluorite-type crystals were studied by Raman spectroscopy. The Er:(M1,M2)F2 crystals exhibited a slightly inhomogeneous broadening of mid-infrared luminescence spectra as compared to the ‘parent’ compound, Er:SrF2. The luminescence lifetimes of the 4I11/2 and 4I13/2 manifolds were measured, e.g., for the Er:(Ca,Sr)F2 crystal, the luminescence lifetimes were estimated to be 8.64 ms and 5.64 ms, respectively, representing a favorable ratio for mid-IR laser operation.

4:30pm - 6:00pmTOM8 S03: Nonlinear and Quantum Optics 3
Location: B328
Session Chair: Kamel Bencheikh, Centre of Nanoscience and Nanotechnology, C2N-CNRS, France
4:30pm - 5:00pm
ID: 397 / TOM8 S03: 1
TOM 8 Non-linear and Quantum Optics

Quantum networks and computations with spins in diamond.

Tim Hugo Taminiau

QuTech, Netherlands, The

Electron-nuclear spin systems based on optically active defects in diamond provide a promising platform for distributed quantum simulations and computation. In this approach, optically active defect spins are used to form multi-qubit processors that can be linked together in a network through photonic links [1,2]. Quantum error correction and computations are then distributed over the network.

In this talk I will introduce such spin-based distributed quantum computations and present our recent progress. In particular, we have recently shown that it is possible to control large numbers of nuclear spins around a single NV center [1], and to use these qubits for quantum simulations of many-body physics [3] and for encoding fault-tolerant logical qubits [4].


[1] C. E. Bradley et al., Phys. Rev. X. 9, 031045 (2019)

[2] M. Pompili et al., Science 372, 259 (2021)

[3] J. Randall et al., Science 374, 1474 (2021)

[4] M. H. Abobeih et al. Nature 606, 884 (2021)

5:00pm - 5:15pm
ID: 293 / TOM8 S03: 2
TOM 8 Non-linear and Quantum Optics

Wide-field broadband CARS microscopy

Chiara Ceconello1, Federico Vernuccio1, Alejandro De la Cadena1, Arianna Bresci1, Francesco Manetti1, Subir Das1, Renzo Vanna2, Giulio Cerullo1,2, Dario Polli1,2

1Department of Physics, Politecnico di Milano, P.zza Leonardo da Vinci 32, 20133 Milan, Italy; 2CNR Institute for photonics and nanotechnologies (IFN), P.zza Leonardo da Vinci 32, 20133 Milan, Italy

Coherent anti-Stokes Raman scattering is an extremely powerful non-linear optical (NLO) microscopy technique for label-free vibrational imaging allowing for a detailed study of biological samples in their native state. To overcome the long acquisition times associated with raster sample scanning required in NLO microscopy, which impair real-time investigation of fast biological dynamics, we employ here wide-field signal generation over a large field of view, covering tens of micrometers. To this aim, we exploit an innovative approach based on the use of an amplified femtosecond ytterbium laser source delivering high energy (≈μJ) pulses in the near infrared. This enables the generation of stable broadband Stokes pulses to measure the entire fingerprint region of the molecular vibrational spectrum, the richest in chemical information. Our results pave the way for future translational applications and clinical diagnostics with video-rate imaging capabilities.

5:15pm - 5:30pm
ID: 149 / TOM8 S03: 3
TOM 8 Non-linear and Quantum Optics

Demonstration of propagation-invariant 3D space-time wave packets

Murat Yessenov1, Justin Free2, Zhaozhong Chen3, Eric Johnson2, Martin Lavery3, Miguel Alonso4,5, Ayman Abouraddy1

1University of Central Florida, United States of America; 2Clemson University, United States of America; 3University of Glasgow, United Kingdom; 4Aix Marseille University, France; 5University of Rochester, United States of America

We present the first demonstration of propagation-invariant space-time (ST) wave packets localized in all dimensions. By introducing orbital-angular-momentum into the wave packets, we produce propagation-invariant ST-OAM wave packets traveling at arbitrary group velocities.

5:30pm - 6:00pm
ID: 196 / TOM8 S03: 4
TOM 8 Non-linear and Quantum Optics

Non-locality and single object spectroscopy in THz Landau polaritons

Giacomo Scalari1, Shima Rajabali1, Elsa Jöchl1, Sergej Markmann1, Simone De Liberato2, Erika Cortese2, Mattias Beck1, Jerome Faist1

1Insititute for Quantum Electronics, ETH Zürich, Switzerland; 2Department of Physics and Astronomy, Univ. of Southampton, UK

We will discuss, theoretically and experimentally, the existence of a limit to the possibility of arbitrarily increasing electromagnetic confinement in polaritonic systems. Strongly sub-wavelength fields can excite a continuum of high-momenta propagative magnetoplasmons. This leads to peculiar nonlocal polaritonic effects, as certain polaritonic features disappear and the system enters in the regime of discrete-to-continuum strong coupling. We will as well discuss experiments reporting spectroscopy of a single, ultrastrongly coupled, highly subwavelength resonator operating at 300 GHz.

8:00pm - 11:00pmCONFERENCE DINNER
Location: Mosteiro São Bento da Vitória

Conference dinner at Mosteiro

The dinner begins at 20:00