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!

Please note that all times are shown in the time zone of the conference. The current conference time is: 6th Dec 2022, 09:01:32pm WET

Session Overview
Date: Tuesday, 13/Sept/2022
9:00am - 10:15amOPENING CEREMONY
Location: Auditorium
10:15am - 11:00amPLENARY SPEECH: Rachel Grange
Location: Auditorium
Session Chair: Sebastien Bidault, Institut Langevin, ESPCI Paris, CNRS, France

Professor at ETH Zurich, Department of Physics, Institute for Quantum Electronics, Optical Nanomaterial Group, Switzerland

Title: Nonlinear and Electro-Optic Metal-Oxides for Telecom and Sensing Devices

11:00am - 11:30amCoffee Break
Location: Lunch & Coffee Tent
11:30am - 1:00pmTOM11 S01: Tapered optical fibers, from fundamental to applications: Nanofiber laser application
Location: B031
Session Chair: Philipp Schneeweiss, Humboldt-Universität zu Berlin, Germany
11:30am - 12:00pm
ID: 355 / TOM11 S01: 1
TOM 11 Tapered optical fibers, from fundamental to applications

Tapered multicore fibers for energy-scalable fiber laser systems

Christopher Aleshire1, Albrecht Steinkopff1, Arno Klenke1,2, Cesar Jauregui1, Steffen Böhme3, Tobias Koch3, Stefan Kuhn3, Johannes Nold3, Nicoletta Haarlammert3, Thomas Schreiber3, Jens Limpert1,2,3

1Institute of Applied Physics, Friedrich-Schiller-University Jena, Jena, Germany; 2Helmholtz-Institute Jena, Jena, Germany; 3Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany

With active multicore fibers (MCFs), many parallel amplifying waveguides can be densely assembled into a common glass cladding. A tapered fiber geometry applied to MCFs enhances the power- and energy scalability of these systems by increasing the doped waveguide volume and reducing peak irradiance while maintaining low output mode order. Recent high-energy experiments have achieved 37 mJ ns-class pulse energies with Yb-doped tapered MCFs, with potential application to a new generation of compact MCF-based coherently-combined laser systems. In this submission, latest experimental results with tapered MCFs and flexible fabrication of taper profiles as a post-draw processing step will be discussed. Numerical analyses of MCF tapers will be presented, using beam propagation method (BPM) and mode-decomposition techniques to study mode coupling and inter-core crosstalk. These simulations are used to guide the tapering of existing fibers and aid the design of future “taper-ready” MCFs.

12:00pm - 12:15pm
ID: 201 / TOM11 S01: 2
TOM 11 Tapered optical fibers, from fundamental to applications

High peak/average power picosecond pulsed MOPA system with tapered large mode area double-clad Yb-doped fiber

Vasilii Ustimchik, Evgenii Motorin, Valery Filippov

Ampliconyx Oy, Finland

We present a near single-mode narrow band high power pulsed MOPA laser system works from 1 to 20 MHz repetition rate and delivered over 600 W of average power at 20 MHz (600kW of peak power and 30 µJ pulse energy) and over 3 MW of peak power at 1 MHz with spectral bandwidth lower than 210 pm.

12:15pm - 12:30pm
ID: 218 / TOM11 S01: 3
TOM 11 Tapered optical fibers, from fundamental to applications

Study of laser induced temperature variation in silica nanofibers

Sylvie Lebrun1, Yanis Abdedou1, Mondher Besbes1, Philippe Delaye1, Jean-Charles Beugnot2, Jacques Chrétien2, Maxime Romanet2, Simon Colombel2, Jérôme Salvi2, Maxime Zerbib2, Kien Phan Huy2

1Laboratoire Charles Fabry, France; 2Institut FEMTO-ST, France

After presenting a theoretical modelling based on the heat equation, we show two different experiments to measure the laser induced temperature variation in silica nanofibers in air, a direct one and an indirect one based on Brillouin scattering, leading to an estimated value of the convective parameter h.

12:30pm - 1:00pm
ID: 202 / TOM11 S01: 4
TOM 11 Tapered optical fibers, from fundamental to applications

Tapered hollow-core photonic crystal fibers

Frédéric Gérôme1,2, Jonas Osorio1, Foued Amrani1,2, Benoit Debord1,2, Fetah Benabid1,2

1GPPMM group, Xlim research institute, France; 2GLOphotonics

In this communication, we will first review the recent advances of hollow-core photonic crystal fibers. Then, the possibility offered to tailor their optical properties by making tapers will be discussed.

11:30am - 1:00pmTOM12 S01: Optofluidics: Morphological Optofluidics
Location: B328
Session Chair: Paulo Marques, University of Porto & INESCTEC, Portugal
11:30am - 12:00pm
ID: 324 / TOM12 S01: 1
TOM 12 Optofluidics

Microdroplet lasers and their applications

Matjaž Humar1,2,3

1Condensed Matter Department, J. Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia; 2Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, SI-1000, Ljubljana, Slovenia; 3CENN Nanocenter, Jamova 39, SI-1000 Ljubljana, Slovenia

Bio-integrated lasers, that are lasers made of biological and biocompatible materials and implanted into cells and tissues, are gaining interest from the research community. Here we show how whispering gallery mode microlasers and microcavities made of solid beads or droplets can be used for sensing different processes in biological materials including inside cells. By making microcavities of a predefined size they can also be used to encode some information and for cell tracking. Sensing and tracking can be applied to highly scattering tissues.

12:00pm - 12:15pm
ID: 151 / TOM12 S01: 2
TOM 12 Optofluidics

Imprinting characteristics of droplet lenses on liquid-repelling surfaces into light

Valeriia Bobkova1, Eileen Otte2,3, Sarah Trinschek4, Cornelia Denz1

1Institute of Applied Physics, University of Muenster, Germany; 2Geballe Laboratory for Advance Materials, Stanford University, USA; 3Center for Soft Nanoscience, University of Muenster, Germany; 4Department of Engineering Physics, Muenster University of Applied Sciences, Germany

We propose an experimental method that allows the investigation of droplets on liquid-repelling surfaces. The described technique goes beyond the standard imaging approaches and reveals a plethora of spatial droplet information, which is usually unavailable. Liquid droplet lenses shape the transmitted light field of a Gaussian laser beam passing though them, thereby forming refracted three-dimensional (3D) light landscapes. We investigate numerically and experimentally these 3D landscapes which are customized depending on the droplet shape as well as its refractive index and demonstrate the encoding of droplet information. This approach can also be applied for analyzing droplets showing high-speed dynamics, in order to reveal even minimal shape deviations. The developed technique can be used to complement the existing conventional tools for the investigation of the droplets formed on liquid-repelling surfaces.

12:15pm - 12:30pm
ID: 210 / TOM12 S01: 3
TOM 12 Optofluidics

Design of an all-liquid anamorphic imaging device

Daniel Sauter, Pengpeng Zhao, Hans Zappe

University of Freiburg, Germany

The design of a novel anamorphic optofluidic imaging system based on a pair of liquid lenses whose toroidal surfaces create different optical powers in the symmetry-axes is presented. Using electrowetting-on-dieletrics for actuation, a cylindrical fluidic system is actuated by 32 azimuthally-distributed electrodes allowing the definition of non-rotationally-symmetric surface shapes. We present the design and simulation of this optical system and show that an anamorphic ratio of 1.43 at a maximum field of view of 6.82° is attainable.

12:30pm - 12:45pm
ID: 332 / TOM12 S01: 4
TOM 12 Optofluidics

Analysis of size and concentration of microplastics in water using static light scattering combined with PCA and LDA

Mehrdad Lotfi Choobbari1, Leonardo Ciaccheri2, Tatevik Chalyan3, Barbara Adinolfi2, Wendy Meulebroeck3, Heidi Ottevaere3

1Vrije Universiteit Brussel, Department of Applied Physics and Photonics, Brussel Photonics, Pleinlaan 2, 1050 Brussels, Belgium; 2CNR-Istituto di Fisica Applicata "Nello Carrara", Via Madonna del Piano 10 - 50019, Sesto Fiorentino (FI) -Italy; 3Vrije Universiteit Brussel and Flanders Make, Department of Applied Physics and Photonics, Brussel Photonics, Pleinlaan 2, 1050 Brussels, Belgium

Quantitative analysis of size and concentration of microplastics is a crucial step for having a better understanding of plastic pollution in the environment. Such information is typically obtained in a single particle mode that significantly increases the analysis time and can be a cumbersome task. Therefore, we demonstrate here a measurement technique based on Static Light Scattering (SLS) combined with chemometric methods such as Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA) for resolving the size and concentration of multiple microplastic particles in water. Two sets of samples with uniform and non-uniform size distribution of microplastics, called “monodisperse” and “polydisperse”, respectively, are fully investigated. It is shown that a relationship exists between the scattering signals of mono- and polydisperse samples on the PCA space. Hence, a PCA-LDA model that is constructed on the PCA space of monodisperse samples is used to discriminate the size of the microplastics in polydisperse samples. By specifying the size of the particles, their concentration is determined using a simple linear fit.

12:45pm - 1:00pm
ID: 296 / TOM12 S01: 5
TOM 12 Optofluidics

Deformation and shapping of optically trapped microdroplets: an ab-initio numerical study.

Hugo Chesneau1,2, Hamza Chraibi2, Jean-Pierre Delville2

1Commissariat à l’Energie Atomique et aux Energies Alternatives, Centre d’Etudes Scientifiques et Techniques d’Aquitaine, F-33116 Le Barp, France.; 2Université de Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France

We numerically study the deformation of optically trapped microdroplets with optical tweezers using a house-made code based on the boundary elements method. Particular attention is paid to the droplets deformations itself and on the coupling between the electromagnetic waves forming the trap and the resulting droplets morphologies.

11:30am - 1:00pmTOM13 S01: Advances and Applications of Optics and Photonics
Location: B035
Session Chair: M.Teresa Flores-Arias, Universidade de Santiago de Compostela, Spain
11:30am - 12:00pm
ID: 328 / TOM13 S01: 1
TOM 13 Advances and Applications of Optics and Photonics

Novel ultrafast structured EUV/x-ray sources from nonlinear optics

Carlos Hernández-García

Universidad de Salamanca, Spain

Coherent extreme-ultraviolet (EUV)/x-ray laser sources, structured in their temporal/spectral, spatial and angular momentum properties are emerging as unique tools to probe the nanoworld. One of the key ingredients for the emergence of such sources is the extraordinary coherence in the up-conversion of infrared laser sources through the highly nonlinear process of high-order harmonic generation. In this contribution we will review the advances during the last decade that led to the generation of structured EUV/x-ray sources, such as circularly polarized attosecond pulses, harmonic vortices with time-varying orbital angular momentum, ultrafast vector and vector/vortex beams, tunable high-order harmonic combs or attosecond pulse trains with time-dependent polarization states. The use of such sources is being already applied to the investigation of chiral matter or magnetic materials. In the latter case, structured ultrafast sources are very promising to achieve a complete understanding of the electronic and spin interactions that govern sub-femtosecond magnetization dynamics.

12:00pm - 12:15pm
ID: 213 / TOM13 S01: 2
TOM 13 Advances and Applications of Optics and Photonics

Characterisation of the stability and long-term evolution of the properties of a 45TW laser operating at 10Hz

Aarón Alejo1, Adrián Bembibre1, Juan Peñas1, José Benlliure1, Lucía Martín2, María Teresa Flores-Arias2,3

1Instituto Galego de Física de Altas Enerxías (IGFAE). Universidade de Santiago de Compostela (Spain); 2Laboratorio Láser de Aceleración y Aplicaciones (L2A2). Universidade de Santiago de Compostela (Spain); 3Instituto de Materials (iMATUS). Universidade de Santiago de Compostela (Spain)

Industrial quality applications of high-power lasers working at high repetition rates, including laser-driven particle acceleration, will require laser systems capable of operating in a stable and prolonged manner. Several factors can affect this stability, including the environment conditions, such as temperature or humidity, and the progressive heating of the optical components involved. Here we report on the evolution of the main laser parameters for a 45 TW system operating at 10 Hz, showing that a significant change in the wavefront and direction of propagation, even when the laser energy remains sufficiently constant. These results highlight the importance for future laser systems to integrate closed-loop beam tracking diagnostics that can correct the temporal evolution.

12:15pm - 12:30pm
ID: 126 / TOM13 S01: 3
TOM 13 Advances and Applications of Optics and Photonics

Ultraestable spatiotemporal characterization of optical vortices in the visible and near infrared

Miguel López-Ripa, Íñigo J. Sola, Benjamín Alonso

Grupo de Aplicaciones del Láser y Fotónica (ALF), Departamento de Física Aplicada, Universidad de Salamanca, Spain

We show the versatility of the bulk lateral shearing interferometer characterizing complex spatiotemporal structures in different spectral ranges. Specifically, we have characterized constant and time-varying optical vortices in the visible and near infrared spectral ranges respectively. The high stability of the system combined with its spectral versatility will ease the spatiotemporal characterization of ultrafast phenomena.

12:30pm - 12:45pm
ID: 174 / TOM13 S01: 4
TOM 13 Advances and Applications of Optics and Photonics

10 PW Peak Power Laser at the Extreme Light Infrastructure Nuclear Physics – status updates

Ioan Dancus1, Gabriel V Cojocaru1, Robert Schmelz1, Dan G Matei1, Lidia Vasescu1, Dmitrii Nistor1, Anda-Maria Talposi1,2, Vicentiu Iancu1,2, Gabriel P Bleotu1,2,3, Andrei Naziru1,2, Alexandru Lazar1, Alice Dumitru1, Antonia Toma1, Marius Neagoe1, Stefan Popa1,2, Saidbek Norbaev1, Cristian Alexe1, Andreea Calin1, Costin Ene1, Adrian Toader1, Nicolae Stan1, Mihai Caragea1, Sorin Moldoveanu1, Olivier Chalus4, Christophe Derycke4, Christophe Radier4, Sandrine Ricaud4, Vincent Leroux4, Caroline Richard4, François Lureau4, Andrei Baleanu5, Romeo Banici5, Alexandru Alincutei5, Iulian Moroianu5, Andrei Gradinariu5, Constantin Caldararu5, Cristian Capiteanu5, Daniel Ursescu1, Domenico Doria1, Ovidiu Tesileanu1, Takahisa Jitsuno1, Razvan Dabu1, Kazuo A Tanaka1, Sydney Gales1, Calin Alexandru Ur1

1Extreme Light Infrastructure - Nuclear Physics, IFIN-HH, Street Reactorului 30, 077125 Bucharest Magurele, Romania; 2Physics Doctoral School, Bucharest University, Magurele, Ilfov, 077125, Romania; 3LULI-CNRS, CEA, Université Sorbonne, École Polytechnique, Institut Polytechnique de Paris, F-91128 Palaiseau Cedex, France; 4Thales LAS France, 2 Avenue Gay Lussac, 78990 Élancourt, France; 5Thales Systems Romania, Soseaua Orhideelor 15a, 060071 Bucuresti, Romania

We have shown, for the first time in the world, the production of 10 PW peak power laser pulses and their propagation to an experimental area at the Extreme Light Infrastructure - Nuclear Physics (ELI-NP). We are also steadily running the laser system for experimental campaigns, increasing the output power levels delivered for experiments and fine-tuning the parameters of the laser pulses, the operational procedures, and the operational teams. During our presentation, we will show the laser developments at ELI-NP emphasizing the 10 PW peak power demonstrations and the latest results for the HPLS beam delivery.

11:30am - 1:00pmTOM2 S01: Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven: Freeform Systemssystems:
Location: B120
Session Chair: Wilbert IJzerman, Signify, Netherlands, The
11:30am - 12:00pm
ID: 338 / TOM2 S01: 1
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Extended field-of-view light-sheet microscopy

Tom Vettenburg

University of Dundee, United Kingdom

Light-sheet fluorescence microscopy enables rapid 3D imaging of biological samples. Unlike confocal and two-photon microscopes, a light-sheet microscope illuminates the focal plane with an objective orthogonal to the detection axis and images it in a single snapshot. Its combination of height contrast and minimal sample exposure make it ideal to image thick samples with sub-cellular resolution. To uniformly illuminate a wide field-of-view without compromising axial resolution, propagation-invariant light-fields such as Bessel and Airy beams have been put forward. These beams do however irradiate the sample with a relatively broad transversal structure. The fluorescence excited by the side lobes of Bessel beams can be blocked physically during recording, at the cost of increased sample exposure. In contrast, the Airy beam has a fine transversal structure that is both curved and asymmetric. Its fine structure captures all the high-frequency components that enable high axial resolution without the need to discard useful fluorescence. This advantage does not carry over naturally to two-photon excitation where the fine transversal structure is suppressed. We demonstrate a symmetric and planar Airy light-sheet that can be used with two-photon excitation and that does not rely on deconvolution.

12:00pm - 12:15pm
ID: 164 / TOM2 S01: 2
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Irradiance tailoring with multiple sources using B-spline refinement

Alexander Heemels, Aurèle Adam, Paul Urbach

TU Delft, Applied Physics, Optics Research Group, Delft, The Netherlands

To increase the irradiance generated by an illumination system, multiple sub-systems, each generating their own irradiance distribution can be used. We propose a method using B-spline refinement to find the irradiance distribution that a single sub-system produces, so a desired irradiance distribution is obtained using multiple sub-systems.

12:15pm - 12:30pm
ID: 136 / TOM2 S01: 3
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Design of optical surfaces conform the hyperbolic Monge-Ampère equation

Maikel W.M.C. Bertens1, Martijn J.H. Anthonissen1, Jan H.M. ten Thije Boonkkamp1, Wilbert L. IJzerman1,2

1Technische Universiteit Eindhoven, Netherlands, The; 2Signify Research, The Netherlands

We present a method for designing freeform optical surfaces for illumination optics. By the laws of reflection, refraction and conservation of energy, a fully nonlinear PDE, the Monge-Ampère quation, is derived for the optical surface. By the edge ray principle a transport boundary condition is obtained. We solve the hyperbolic variant of the PDE using a least-squares method, resulting in optical saddle surfaces for a parallel source and far-field target.

12:30pm - 12:45pm
ID: 143 / TOM2 S01: 4
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Including Fresnel reflection losses in freeform lens design

Teun van Roosmalen1, Jan H. M. ten Thije Boonkkamp1, Martijn J. H. Anthonissen1, Wilbert L. IJzerman1,2

1Eindhoven University of Technology, Netherlands, The; 2Signify Research, The Netherlands

We present an inverse method for optical design that compensates local Fresnel reflections. We elaborate this method for a point source and far-field target. We modify an existing design algorithm based on the least-squares method. This is done in such a way that the shape of the transmitted intensity is as desired.

12:45pm - 1:00pm
ID: 161 / TOM2 S01: 5
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

A discontinuous Galerkin method to solve Liouville's equation of geometrical optics

Robert A.M. van Gestel1, Martijn J.H. Anthonissen1, Jan H.M. ten Thije Boonkkamp1, Wilbert L. IJzerman1,2

1Eindhoven University of Technology, Netherlands, The; 2Signify

We present an alternative method to ray tracing that is based on a phase space description of light propagation. Liouville's equation of geometrical optics describes the evolution of the basic luminance on phase space. At an optical interface, the laws of optics describe non-local boundary conditions for the basic luminance. A discontinuous Galerkin method is employed to solve Liouville's equation for a dielectric total internal reflection concentrator.

11:30am - 1:00pmTOM3 S01: Optical System Design, Tolerancing and Manufacturing
Location: B032
Session Chair: Marco Hanft, Carl Zeiss AG, Germany
11:30am - 12:00pm
ID: 313 / TOM3 S01: 1
TOM 3 Optical System Design, Tolerancing and Manufacturing

Optical Design at The Age of AI

Simon Thibault

University Laval, Canada

Data-driven methods to assist lens design have recently begun to emerge; in particular, under the form of lens design extrapolation to find starting points (lenses and freeform reflective system). I proposed a trip over the years to better understand why the AI have been applied first to the starting point problems and where we are going in the future.

12:00pm - 12:15pm
ID: 180 / TOM3 S01: 2
TOM 3 Optical System Design, Tolerancing and Manufacturing

A systematic view of microscope objective design

Yueqian Zhang1, Herbert Gross2

1Carl Zeiss AG, Germany; 2Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Germany

The correction of modern microscope objectives is not usually discussed in literature. We have reported a system review and summarized the design principles in a series of papers in 2019. Here we are introducing the systematic view of microscope objective design with an extension of the database till 2021. Furthermore, a systematic synthesis approach aided by AI will also be discussed.

12:15pm - 12:45pm
ID: 192 / TOM3 S01: 3
TOM 3 Optical System Design, Tolerancing and Manufacturing

Plasma jet assisted polishing of fused silica freeform optics

Thomas Arnold1,2, Georg Boehm2,3, Heike Mueller2, Martin Ehrhardt2, Klaus Zimmer2

1Technische Universität Dresden, Institut für Fertigungstechnik, Dresden, Germany; 2Leibniz Institute of Surface Engineering (IOM), Leipzig, Germany; 3Trionplas technologies, Leipzig, Germany

Atmospheric pressure plasma jet machining technology not only provides a flexible and efficient way to generate and correct optical freeform surfaces made of fused silica, it can also be applied as a surface smoothing or polishing technique. Thermal plasma jet treatment leads to softening and redistribution of the material. An accurate temperature regime during the process is inevitable to achieve a uniformly smoothed surface. The possibilities for in-process temperature control are demonstrated. Surface roughness values can be significantly reduced by a factor of 1000 depending on the initial roughness of the ground surface.

12:45pm - 1:00pm
ID: 315 / TOM3 S01: 4
TOM 3 Optical System Design, Tolerancing and Manufacturing

Neural Network for optical performance Estimation and advanced Lens Combination

Robert Brüning, Michael Verhoek, Uwe Lippmann

Fraunhofer Institute of Applied Optics and Precision Engineering IOF, Germany

We developed an algorithm to estimate the performance of an optical system based on the errors of its individual components. After a short training period with classical simulated systems, the performance evaluation for tolerancing could be accelerated by a factor of about three million. Additionally, we propose a probability-based sorting algorithm to combine individual, erroneous components in order to compensate for the tolerance budget within the system and increase the overall yield.

11:30am - 1:00pmTOM7 S01: Thermal radiation and energy management 1
Location: B116
Session Chair: Marco Centini, Sapienza University of Rome, Italy
11:30am - 12:00pm
ID: 267 / TOM7 S01: 1
TOM 7 Thermal radiation and energy management

Active control of near-field radiative heat transfer in many-body systems

Philippe Ben Abdallah

Laboratoire Charles Fabry, CNRS, Institut d'Optique, France

Understanding and controlling the time evolution of thermal state of a system in nonequilibrium situation is of tremendous importance both on a fundamental and practical point of view. Many strategies have been implemented to date to actively control this evolution using an external driving.

In the first part of this talk I will describe the thermal relaxation of non-Hermitian many-body systems coupled to their environment subject to periodic drivings both in adiabatic limit and beyond this limit.

In the second part I will describe the dynamic control of thermal state of many-body systems and discuss some problems of practical interest such as the thermal targeting, insulation of some elements and the synchronization of local states during the relaxation process. I will also derive the conditions to fulfill in order to accelerate the relaxation process with a minimum energetic cost and to cool some elements with a minimum time.

12:00pm - 12:30pm
ID: 262 / TOM7 S01: 2
TOM 7 Thermal radiation and energy management

Thermal radiation in dipolar many-body systems

Svend-Age Biehs

Oldenburg University, Germany

The framework of fluctuational electrodynamics for dipolar many-body systems is one of the working horse for theoretical studies of thermal radiation at the nanoscale which includes dissipation and retardation in a naturally way. Based on this framework I will discuss near-field thermal radiation in non-reciprocal and topological many-body systems. The appearance of the Hall and non-reciprocal diode effect for thermal radiation illustrates nicely the interesting physics in such systems as well as the edge mode dominated heat transfer in topological Su-Schrieffer-Heeger chains and a honeycomb lattices of plasmonic nanoparticles. In the latter, the theory allows for quantifying the efficiency of the edge-mode dominated heat transfer as function of the dissipation. Finally, I will present how the theoretical framework can be generalized to study far-field thermal emission of many-body systems close to an environment like a substrate, for instance. This theory might be particularly interesting for modelling thermal imaging microscopes.

12:30pm - 1:00pm
ID: 138 / TOM7 S01: 3
TOM 7 Thermal radiation and energy management

Quantum levitation of photonic structures

Sol Carretero Palacios

Universidad Autónoma de Madrid, Spain

The Casimir-Lifshitz force originates from the quantum vacuum fluctuations of the electromagnetic field. This force is especially intense between interacting objects at nanoscale distances, and it can be attractive or repulsive depending on the optical properties of the materials (amongst other parameters). This fundamental phenomenon is at the heart of the malfunctioning of nano- and micro-electromechanical devices (NEMS and MEMS) that integrate many of the gadgets we use in our daily lives. Absolute control over these forces would make it possible to suppress adhesion and friction in these NEMs and MEMs. Here, we will show the possibility of controlling the Casimir-Lifshitz force by tuning the optical properties of the interacting objects. Specifically, we will present diverse examples of quantum levitation based on the Casimir-Lifshitz force of self-standing thin films comprising multilayer structures and films with spatial inhomogeneities (caused by imperfections, pores, inclusions, density variations, etc).

11:30am - 1:00pmTOM9 S01: Opto-electronic Nanotechnologies and Complex Systems: Plasmonics
Location: B231
Session Chair: Vito Mocella, CNR, Italy
11:30am - 12:00pm
ID: 307 / TOM9 S01: 1
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

All-dielectric sensing platform based on bound states in the continuum: biological and healthcare applications

Silvia Romano

CNR, Italy

Large-area and transparent all-dielectric metasurfaces sustaining photonic bound states in the continuum (BICs) provide a set of fundamental advantages for ultrasensitive biosensing. A BIC is a special mode in the energy continuum of free space waves that cannot couple with free-space radiation, which leads to a diverging radiative Q-factor and a topological singularity in the reciprocal space. Here, we present several applications of BICs for surface amplification of fluorescence emission and Raman scattering, biological and chemical sensing with capability of detecting ultralow-weight molecules and protein traces. This approach aims at a precise and ultrasensitive approach for developing low-cost point-of-care tools suitable for routine disease prescreening analyses in laboratory, also adaptable to industrial production control and can be extended to many other applications for studying physical, chemical, and biological processes.

12:00pm - 12:15pm
ID: 264 / TOM9 S01: 2
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Plasmonic and 2D-TMD nanoarrays for large-scale photon harvesting and enhanced molecular photo-bleaching

Giulio Ferrando1, Matteo Gardella1, Matteo Barelli1, Debsree Chowdhury1, Pham Duy Long2, Nguyen Si Hieu2, Maria Caterina Giordano1, Francesco Buatier De Mongeot1

1Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, I-16146 Genova, Italy; 2Institute of Materials Science, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam

The urgent environmental and energy challenges require novel solutions for efficient light harvesting and conversion in new-generation ultra-thin devices. Plasmonic nanoantennas and flat optics nanogratings can promote light matter interaction at the nanoscale being very attractive for ultra-thin photonics and sensing applications. In this work we developed two light trapping solutions based on large-scale nanomaterials. The first system is a large-scale (cm2) plasmonic metasurface based on self-organized gold nanostripes. The second is based on the periodic re-shaping of ultra-thin semiconducting MoS2 layers forming large-area flat-optics nanogratings. Under this condition Rayleigh Anomalies can be resonantly excited thus promoting in-plane light confinement and photon absorption into the few-layers material. To demonstrate the impact of these nanopatterned systems in photon harvesting we probed their efficiency into a prototypal photochemical reaction: the photo-bleaching of Methylene Blue (MB). We demonstrate the resonant enhancement of the photo-bleaching of these polluting dye molecules promoted either by the localized plasmon resonance in Au nanostripes or by the Rayleigh Anomaly in flat-optics MoS2 nanogratings. We investigate this effect through a quantitative analysis of the solution photodissociation induced by a monochromatic light. These results show the strong potential of flat-optics templates for light-harvesting and energy conversion in ultra-thin photonic devices.

12:15pm - 12:45pm
ID: 346 / TOM9 S01: 3
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

3D Chiral metamaterials for biosensing

Vittorianna Tasco

CNR, Italy

In this contribution we will discuss the experimental application of 3D chiral metamaterials as high sensitivity biosensors, exploiting circular dichroism in transmission. 3D metamaterials with chiral features can be realized by highly accurate and highly localized bottom-up nanofabrication approach. Large chiroptical effects can be engineered, originating from the single element optical resonances, but collective interactions in arrayed configurations can play a significant role, further enhancing these effects. Capability of biomarker detection in the femtomolar range is demonstrated even in complex biofluid matrix.

1:00pm - 2:30pmLunch Break
Location: Lunch & Coffee Tent
2:30pm - 4:00pmEU S01: EU Project Session
Location: B324

Talks in this session:

  • Christophe Dujardin (Project: SPARTE), Scintillating porous architectures for radioactive gaz detection
  • Chiara Ceconello (Project: CRIMSON), Coherent Raman Imaging for the Molecular Study of the Origin of Diseases
  • David Hunger (Project: SQUARE), Scalable Rare Ion Quantum Computing Nodes 
  • Hugo Thienpont (Project: ACTPHAST4R), Open Access for European-based Researchers to Photonics High-Technology Platforms: the ACTPHAST4R initiative

2:30pm - 4:00pmTOM11 S02: Tapered optical fibers, from fundamental to applications: Quantum application
Location: B031
Session Chair: Jean-Charles Beugnot, FEMTO-ST/CNRS, France
2:30pm - 3:00pm
ID: 353 / TOM11 S02: 1
TOM 11 Tapered optical fibers, from fundamental to applications

Integrated single photons sources based on tapered optical nanofibers

Quentin Glorieux

LKB, France

Integrated single photons sources based on tapered optical nanofibers

3:00pm - 3:15pm
ID: 131 / TOM11 S02: 2
TOM 11 Tapered optical fibers, from fundamental to applications

Using optical nanofibres to mediate cold atom interactions

Sile Nic Chormaic

OIST Graduate University, Japan

We discuss several recent advances related to optical nanofibres in cold atom systems, including two-colour dipole trap optimisation using an in-loop stochastic artificial neural network machine learner, upper bound limitations on Rydberg atom excitation due to localised ion formation, spectral lineshapes arising from the high intensity evanescent fields, and two-photon processes mediated via the evanescent field of the optical nanofibre

3:15pm - 3:30pm
ID: 235 / TOM11 S02: 3
TOM 11 Tapered optical fibers, from fundamental to applications

Rydberg atoms in the vicinity of an optical nanofiber

Erwan Stourm1, Maxence Lepers2, Jacques Robert1, Sile Nic Chormaic3, Klaus Mølmer4, Etienne Brion5

1Université Paris-Saclay, CNRS, Laboratoire de physique des gaz et des plasmas, 91405, Orsay, France; 2Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS, Université de Bourgogne Franche-Comté, 21078 Dijon, France; 3Light-Matter Interactions for Quantum Technologies Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa, 904-0495, Japan; 4Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark; 5Laboratoire Collisions Agrégats Réactivité, IRSAMC and UMR5589 du CNRS, Université de Toulouse III Paul Sabatier, F-31062 Toulouse Cedex 09, France

Highly excited (so-called Rydberg) atoms are the key ingredient of many quantum information

schemes. In this presentation, we shall theoretically investigate how spontaneous emission properties and van

der Waals interactions of such atoms are modified in the neighbourhood of an optical nanofiber with respect

to the free-space (vacuum) case. This work constitutes a very preliminary step towards the realization of a

quantum network based on atomic ensembles linked via optical nanofibers.

3:30pm - 3:45pm
ID: 188 / TOM11 S02: 4
TOM 11 Tapered optical fibers, from fundamental to applications

Gas-pressure tuning of wavelength of photon pair emitted by Four-Wave-Mixing in Nanofibers

Agathe Bonifacio1, Sylvie Lebrun1, Maxime Zerbib2, Maxime Romanet2, Jean-Charles Beugnot2, Philippe Delaye1

1Laboratoire Charles Fabry, Université Paris Saclay, France; 2Institut FEMTO-ST, Université Bourgogne Franche-Comté, France

We present experimental results demonstrating the possibility to tune the wavelength of the photon pair emitted through four wave mixing in a nanofiber, using the pressure of a gas surrounding the nanofiber. Using Argon, a shift of idler wavelength of -1.1nm/bar is measured demonstrating fine adjustment possibility of emission wavelength, allowing to choose between different WDM channels.

3:45pm - 4:00pm
ID: 176 / TOM11 S02: 5
TOM 11 Tapered optical fibers, from fundamental to applications

Non-reciprocal amplification of light using cold atoms coupled to an optical nanofiber

Sebastian Pucher, Christian Liedl, Shuwei Jin, Arno Rauschenbeutel, Philipp Schneeweiss

Humboldt-Universität zu Berlin, Germany

Optical nanofibers realized as the waist of tapered silica fibers can be used to trap and optically interface laser-cooled atoms. Building on this system, we experimentally show a novel scheme for the non-reciprocal Raman amplification of light. While typically either the magneto-optical effect, a temporal modulation or an optical nonlinearity is employed to break reciprocity, in our approach, this results from the spin of the atoms forming the gain medium. By taking advantage of the inherent spin-momentum locking present in optical nanofibers, we perform an experiment in which we set the amplification direction by a suitable preparation of the atomic spin state. Our approach is general and, suitable quantum emitters provided, could also be implemented beyond the optical domain of the electromagnetic spectrum.

2:30pm - 4:00pmTOM12 S02: Optofluidics: Emerging Concepts
Location: B328
Session Chair: Paulo Marques, University of Porto & INESCTEC, Portugal
2:30pm - 3:00pm
ID: 159 / TOM12 S02: 1
TOM 12 Optofluidics

Heliconical Cholesterics: new opportunities for optofluidics?

Francesco Simoni

ISASI - CNR - Italy, Italy

In this presentation the novelty represented by the heliconical cholesteric liquid crystals (Ch-OH) for easy electric and optical control of optical properties are highlighted. After a quick summary of their electro-optical properties, an account of the recent experimental and theoretical achievements about the nonlinear optical response of Ch-OH will be given. The peculiar conical structure allows an easy control of the spectral location of the Bragg resonance making possible effects never observed previously in pure liquid crystals, making these materials attractive for development of several optical devices.

3:00pm - 3:15pm
ID: 333 / TOM12 S02: 2
TOM 12 Optofluidics

Trapping, characterization and reactions of biocolloids in a salinity gradient

Martin Kjærulf Rasmussen, Jonas Nyvold Pedersen, Rodolphe Marie

Technical University of Denmark, Denmark

The properties of soft matter nanoparticles like exosomes are interesting for drug delivery and diagnostics applications. However, the simultaneous characterization of multiple properties, e.g., size and zeta potential, can only be done serially and is highly sensitive to the purification prior to characterization. Here we show how a salt gradient established in a nanofluidic channel induces opposing transport of particles and liquid that trap the particles. Particles are thus accumulated in the trap. We show how optical microscopy images of the particle positions in the salinity gradient provide a measurement of the size and surface charge. We demonstrate the method on a sample of exosomes and on individual particles. Finally, we show how biomolecular reactions at the surface of the nanoparticle can be detected from the optical microscopy analysis of the particles’ trapping position

3:15pm - 3:30pm
ID: 326 / TOM12 S02: 3
TOM 12 Optofluidics

Size-based chromosome separation in a microfluidic particle separation device using viscoelastic fluids

Therese Rahbek Wassberg1, Mathilde Lassen Witt1, Murat Serhatlioglu1, Christian Friberg Nielsen2, Ian David Hickson2, Anders Kristensen1

1Technical University of Denmark (DTU), Denmark; 2University of Copenhagen (KU), Denmark

Viscoelastic flow-based particle manipulation techniques enable bio-particle focusing, separation, and enrichment by precisely tuning the rheological parameters, flow conditions, and microchannel geometry. In this study, we fabricated a PDMS-based single inlet/outlet microchannel to separate bio-particles by their size ranging from 1-10 µm. Flow conditions and rheological properties are optimized using 2 µm and 4 µm Polystyrene beads to reach the best particle separation condition. We demonstrated the size-based separation of human chromosomes by separating 1-2 µm size small chromosomes from 8-10 µm size large chromosomes. Thanks to its miniaturized size and simplicity, the isolation chip and unique viscoelastic separation method have great potential to be used as a future pioneering tool for genetic applications to study chromosome abnormalities such as fragile-X and trisomy.

2:30pm - 4:00pmTOM13 S02: Advances and Applications of Optics and Photonics
Location: B035
Session Chair: Susana Novais, INESCTEC, Portugal
2:30pm - 2:45pm
ID: 186 / TOM13 S02: 1
TOM 13 Advances and Applications of Optics and Photonics

Dispersion-managed monolithic all polarization-maintaining ultrafast Thulium-doped fiber oscillator

Benedikt Schuhbauer1, Andreas Wienke1,2, Frithjof Haxsen1, Jörg Neumann1,2, Dietmar Kracht1,2

1Laser Zentrum Hannover e.V., Hollerithalle 8, Hannover 30419, Germany; 2Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering Innovation Across Disciplines)

We report on our first results of a dispersion-managed monolithic polarization-maintaining ultrafast Thulium-doped fiber oscillator. The design incorporates only commercially available polarization-maintaining components and emits linearly polarized light with a polarization extinction ratio of over 17 dB . The observed optical pulse spectra with up to 10 nm width centered at 1961.5 nm beyond the water absorption lines support sub-1 ps pulse duration. The simple linear configuration and the wide spread availability of the used low cost polarization-maintaining fiber components makes the presented oscillator a valuable concept for an environmental stable seed source.

2:45pm - 3:00pm
ID: 198 / TOM13 S02: 2
TOM 13 Advances and Applications of Optics and Photonics

Comparison of simulation and experimental characterization of a 4-pass diode-pumped 4-active-mirrors 1053 nm laser amplifier

Thomas Hamoudi1, Hugo Chesneau1, Thomas Dubé1, Emma Dubois1, Manon Lamy1, Cédric Maunier1, Alain Braud2, Cesare Meroni2, Patrice Camy2, Sebastien Montant1

1CEA, CESTA, F-33116 Le Barp, France; 2CIMAP-ENSICAEN, 6 boulevard du Maréchal Juin, 14050 Caen Cedex, France

In this paper, we will discuss the performances of a 4-pass diode-pumped 4-active-mirrors laser amplifier. Numerical simulations along with experimental characterization paves the way to reach 1 J at 10 Hz pulse rate at 1053 nm. Both Nd :glass and Nd :Lu :CaF2 amplifier medium performances will be compared in this amplifier.

3:00pm - 3:15pm
ID: 229 / TOM13 S02: 3
TOM 13 Advances and Applications of Optics and Photonics

Controlling water-window high-harmonic generation with sub-cycle synthesized waveforms

Giulio Maria Rossi1,2, Roland E. Mainz1,2, Fabian Scheiba1,2, Miguel A. Silva-Toledo1,2, Maximilian Kubullek1,2, Franz X. Kärtner1,2

1Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany; 2Physics Department and The Hamburg Centre for Ultrafast Imaging, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

We present the first results concerning synthesizer-driven high-harmonic generation that reach the water-window region. This approach holds the promise of offering greater spectral tunability in the generation of isolated attosecond pulses and at the same time of achieving higher photon-flux, required for attosecondresolved soft X-ray transient absorption experiments.

3:15pm - 3:30pm
ID: 231 / TOM13 S02: 4
TOM 13 Advances and Applications of Optics and Photonics

Unravelling an optical extreme learning machine

Duarte Silva1,2, Nuno Silva1,2, Tiago Ferreira1,2, Carla Rosa1,2, Ariel Guerreiro1,2

1INESC TEC, Portugal; 2Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Portugal

Extreme learning machines (ELMs) are a versatile machine learning technique that can be seamlessly implemented with optical systems. In short, they can be described as a network of hidden neurons with random fixed weights and biases, that generate a complex behaviour in response to an input. Yet, despite the success of the physical implementations of ELMs, there is still a lack of fundamental understanding about their optical implementations. This work makes use of an optical complex media to implement an ELM and introduce an ab-initio theoretical framework to support the experimental implementation. We validate the proposed framework, in particular, by exploring the correlation between the rank of the outputs, 𝑯, and its generalization capability, thus shedding new light into the inner workings of optical ELMs and opening paths towards future technological implementations of similar principles.

2:30pm - 4:00pmTOM2 S02: Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems: Computational
Location: B120
Session Chair: Juergen Czarske, Technische Universität Dresden, Germany
2:30pm - 3:00pm
ID: 325 / TOM2 S02: 1
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Imaging beyond the limits of diffraction and aberrations with computational microscopy

Andrew Robert Harvey, Guillem Carles, Michael Handley, Daniel Olesker, Jonathan Taylor, Conall Thompson, Paul Zammit, Yongzhuang Zhou, Tomas Aidukas

School of Physics and Astronomy, University of Glasgow, United Kingdom

A common requirement for microscopy of biological samples is to image with sub-cellular resolution throughout extended volumes up to 100um thick and across a field of view that may excess 1cm^2. The fundamental limits of diffraction and the practical limits of optical aberrations means that no traditional microscopy technique can achieve these goals without resorting to mechanical scanning. We report two computational microscopy techniques that define the state of the art in 3D high-resolution imaging.

We describe (1) imaging with engineering PSFs to enable three-dimensional localisation microscopy with a spatial resolution approaching one-hundredth of a wavelength throughout a volume that is more than 15 times greater than with conventional localisation microscopy and (2) a new multi-objective Fourier ptychography that enables an arbitrary scaleable increase in the speed of acquisition of gigapixel images.

3:00pm - 3:15pm
ID: 121 / TOM2 S02: 2
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Computation of aberration coefficients for plane-symmetric reflective optical systems using Lie algebraic methods

Antonio Barion1, Martijn Anthonissen1, Jan ten Thije Boonkkamp1, Wilbert IJzerman1,2

1Eindhoven University of Technology, Netherlands, The; 2Signify, Netherlands, The

The Lie algebraic method offers a systematic way to find aberration coefficients of any order for plane-symmetric reflective optical systems. The coefficients derived from the Lie method are in closed form and solely depend on the geometry of the optical system. We investigate and verify the results for a single reflector. The concatenation of multiple mirrors follows from the mathematical framework.

3:15pm - 3:30pm
ID: 320 / TOM2 S02: 3
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Is trans-scleral illumination the future of retinal imaging?

Joel Terry1, Daniel Martin Geddes1, Victor Ochoa-Gutierrez1, Zhiyuan Yang2, Kenneth J. Smith2, Andy R. Harvey1

1University of Glasgow, United Kingdom; 2University College London, United Kingdom

Retinal imaging is an essential tool for monitoring eye and systemic health. Traditional approaches illuminate the retina through the pupil, requiring careful real-time alignment to separate the illumination and imaging paths and prevent the faint retinal image from being swamped by Fresnel reflections, ocular scatter and fluorescence. Somewhat surprisingly, the sclera is sufficiently transmissive to enable efficient trans-scleral illumination of the retina, which prevents overlap of the illumination and imaging light paths. We discuss how this enables and enhances three emerging retinal imaging approaches based on computational imaging.

We will discuss the opportunities for employing trans-scleral illumination for: (a) ultra-widefield aberration correction using the concepts of multi-scale, multi-camera imaging, for which transscleral illumination enables reflex-free imaging for fields of view approaching 200°; for (b) phasor-spectral-fluorescence lifetime imaging with enhanced quantification and discrimination of retinal fluorophores devoid of the lens autofluorescence that plagues conventional illumination; and for (c) spectral retinal oximetry for which reduced intraocular scatter provides improved measurement of vascular contrast and more reliable oximetry.

3:30pm - 3:45pm
ID: 337 / TOM2 S02: 4
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Utilizing adaptive optics to build an inverted lattice lightsheet microscope

Lars-Christian Wittig1, Marco Pretorius1, Thomas Kalkbrenner2, Jörg Siebenmorgen2

1Carl Zeiss AG, Germany; 2Carl Zeiss Microscopy GmbH, Germany

Lightsheet microscopy has become an inevitable tool for low photodamage imaging in developmental biology. Dedicated beamshapes (lattice lightsheets) have extended this unrivalled sample preservation to live cell imaging with high spatio-temporal resolution. With the Lattice Lightsheet 7 Zeiss has made this method widely available and we want to show, that the optical configuration of this microscope is defined by only three key requirements: 1. High SNR at low photodamage, 2. Diffraction limited resolution and sectioning, 3. Consumable type sample carrier. Especially, one can conclude from these demands that an adaptive optical element is essential for the imaging path to achieve high-end performance. In order to account for tolerances of the cover glass we developed a generalised Alvarez lens which fully compensates for associated wavefront errors and thereby ensures highest imaging quality.

3:45pm - 4:00pm
ID: 392 / TOM2 S02: 5
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Design and realization of a miniaturized high resolution computed tomography imaging spectrometer

Simon Amann1, Tobias Haist1, Alexander Gatto2, Markus Kamm2, Alois Herkommer1

1University of Stuttgart, Institut für Technische Optik, Germany; 2Sony Europe B.V, Stuttgart Technology Center, Germany

The computed tomography imaging spectrometer (CTIS) is a relatively unknown snapshot hyperspectral camera. It utilizes computational imaging approaches to gain the hyperspectral image from a spatio-spectral smeared sensor image. We present a strongly miniaturized system with a dimension of only 36 mm x 40.5 mm x 52.8 mm and a diagonal field of view of 29°. We achieve this using a Galilean beam expander and a combination of off-the-shelf lenses, a highly aspherical imaging system from a commercial smartphone and a 13 MP monochrome smartphone image sensor. The reconstructed hyperspectral image has a spatial resolution of 400 x 300 pixel with 39 spectral channels.

2:30pm - 4:00pmTOM3 S02: Optical System Design, Tolerancing and Manufacturing
Location: B032
Session Chair: Oliver Faehnle, OST – Ostschweizer Fachhochschule, Switzerland
2:30pm - 3:00pm
ID: 181 / TOM3 S02: 1
TOM 3 Optical System Design, Tolerancing and Manufacturing

Nautilus: The advent of large lens-based space telescopes

Daewook Kim1,2, Tom D. Milster1, Dániel Apai2,3

1James C. Wyant College of Optical Sciences, The University of Arizona, Tucson, AZ 85721, USA; 2Department of Astronomy and Steward Observatory, The University of Arizona, Tucson, AZ 85721, USA; 3Lunar and Planetary Laboratory, The University of Arizona, Tucson, AZ 85721, USA

One of the most profound and philosophically captivating foci of modern astronomy is studies of Earth-like exoplanets in search of life in the Universe. The paradigm-shifting investigation described here calls for a new type of space telescope that redefines the available light-collecting area in space, far beyond what is currently possible with the 6.5 m diameter James Webb Space Telescope. The Nautilus Space Observatory, which is enabled by multiple-order diffractive optics, is ushering in the advent of large space telescope lenses designed to search for biosignatures on a thousand exo-earths.

3:00pm - 3:15pm
ID: 127 / TOM3 S02: 2
TOM 3 Optical System Design, Tolerancing and Manufacturing

Planarization of lithium niobate surface using a thin film catalyst in pure water

Pho Van Bui1,2, Daisetsu Toh2, Masahiko Kanaoka1, Hiromi Okada1, Satoshi Matsuyama3, Kazuto Yamauchi2, Yasuhisa Sano2

1JTEC Corporation, Japan; 2Osaka University, Japan; 3Nagoya University, Japan

A catalytically assisted etching method, named Catalyst-Referred Etching (CARE) was applied to the planarization of Lithium Niobate (LN) surface, which is widely used for optical waveguides, optical modulators, piezoelectric applications. The study demonstrates that an atomically smooth surface with less than 0.1 nm root-mean-square roughness could be achieved on a LN substrate using a thin metal film and pure water as the catalyst and etching solution, respectively. All residual stress and surface damage could be removed completely thanks to the removal mechanism of CARE.

3:15pm - 3:30pm
ID: 205 / TOM3 S02: 3
TOM 3 Optical System Design, Tolerancing and Manufacturing

Concept, manufacturing and challenges of ultra-compact snapshot multispectral multi-aperture imaging systems

Martin Hubold, Johanna Karl, Robert Leitel, Norbert Danz, Robert Brüning

Fraunhofer IOF, Germany

Snapshot multispectral imaging is a rising non-invasive and contact-free analysis method and technology to discriminate or identify objects based on their spectral characteristics. We demonstrate a versatile system approach for compact and real-time capable snapshot cameras for the visible (VIS) and the near-infrared (NIR) or the short-wave infrared (SWIR) wavelength range based on a micro-optical multi-aperture system and various spectral filter approaches. In addition, the manufacturing, the calibration, and the limitations of the demonstration systems are described.

3:30pm - 3:45pm
ID: 317 / TOM3 S02: 4
TOM 3 Optical System Design, Tolerancing and Manufacturing

Mechanical Integration of a Prism-Grating-Prism-Assembly for the CO2M Mission

Andreas Kamm, Christian Scheffler, Thomas Peschel

Fraunhofer Institute of Applied Optics and Precision Engineering IOF, Germany

We developed and realized a mechanical integration concept of a prism-grating-prism-assembly for the CO2M mission. The mechanical design of the mounts relies on a kinematic mounting of the optical elements. Additional, ultra-light and blackened covers for stray light and disturbance light suppression are included. The complete assembly was investigated by extensive thermo-mechanical simulations to verify the stability of the mechanical design under operational, launch loads and test conditions.

3:45pm - 4:00pm
ID: 167 / TOM3 S02: 5
TOM 3 Optical System Design, Tolerancing and Manufacturing

Optimization of grinding processes on fused silica components using in-process vibrometry and dynamometer measurements

Sebastian Henkel1, Marcel Binder1, Jens Bliedtner1, Marco Fritzsche2, Abdulla Huseynov3, Franziska Schöneweck3, Sascha Greiner-Adam3, Jörg Flügge3, Edda Rädlein4

1Ernst-Abbe University of Applied Sciences Jena; 2Polytec GmbH; 3Batix Software GmbH; 4Technical University Ilmenau

The presented investigations deal with real-time evaluation and recording of vibrations and forces during a CNC grinding process, as well as the analysis and control of process influences on the surface quality of optical components. The experiments were carried out on a 5-axis CNC machine. Rapid subsequent analysis of the topography resulting from grinding is achieved with the aid of white light interferometry. The aim of the investigations is to reduce the surface deviations (roughness, mid-spatials, waviness) influenced by process factors. It is shown that the vibration data measured during the grinding process correlate to a high degree with the recorded topography data.

2:30pm - 4:00pmTOM7 S02: Thermal radiation and energy management 2
Location: B116
Session Chair: Svend-Age Biehs, Oldenburg University, Germany
2:30pm - 3:00pm
ID: 292 / TOM7 S02: 1
TOM 7 Thermal radiation and energy management

Casimir-Lifshitz force at the water-ice interface in the triple point: premelting of ice on a rock surface

Victoria Esteso


Herein we show a theoretical study about ice-premelting on a quartz rock surface based on calculations of the Casimir-Lifshitz force at that interface. In order to do that we consider a four-layer system composed of rock-ice-water-air. In contrast to previous investigations, which only considered variations of the thickness of either the water or the ice layer, here we analyse the equilibrium conditions of the system when both layers may vary their thickness. This enables multiple alternative equilibrium solutions stabilized in part by repulsive Casimir-Lifshitz interactions. Therefore, the final state of a system will depend on initial conditions and may explain variations in experimental measurements of ice-premelting.

3:00pm - 3:30pm
ID: 255 / TOM7 S02: 2
TOM 7 Thermal radiation and energy management

Enhancing the solar-to-thermal energy conversion in high vacuum flat plate solar collectors

Roberto Russo1, Davide De Maio1,2, Carmine D'Alessandro1,2, Daniela De Luca1,3, Antonio Caldarelli1,2, Eliana Gaudino1,2, Marilena Musto1,2, Emiliano Di Gennaro1,3

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

In solar flat plate collectors, the high vacuum insulation suppresses the convective losses increasing the collector efficiency. The solar-to-thermal energy conversion efficiency in such solar thermal collectors is mainly defined by the optical and radiation losses of the selective solar absorber. We present the full process of design, optimization, fabrication, and characterization of multilayer coatings specifically thought for working in high vacuum flat solar thermal collectors at different operating temperatures, from 100 °C to 300 °C. We discuss the relative importance of absorptance and emittance in determining the collector thermal efficiency. The robustness of the performance of the coatings related to the unpreventable errors in layer thickness during the manufacturing stage is also considered through a genetic optimisation algorithm.

3:30pm - 3:45pm
ID: 283 / TOM7 S02: 3
TOM 7 Thermal radiation and energy management

Electrically tunable radiative cooling under ambient conditions

Debashree Banerjee1,2, Tomas Hallberg3, Sampath Gamage1,2, Shangzhi Chen1, Hans Kariis3, Magnus P. Jonsson1,2

1Department of Science and Technology (ITN), Linkoping University, Norrköping 610 74, Sweden; 2Wallenberg Wood Science Center (WWSC), Linköping University, SE-601 74 Norrköping, Sweden; 3Department of Electro Optical Systems, FOI, Linköping, Sweden

The prospect and use of passive radiative coolers for mitigating energy consumption have been and now even more so, attractive for sustainability and environmental conservation. Cellulose-based as well as other organic and inorganic materials have shown promising performance as passive coolers but most of these concepts lacked the capability to dynamically tune the extent of cooling.

In this work we demonstrate the electrical control of radiative cooling at ambient conditions enabled by tuning the thermal emissivity of a conducting polymer. We show that electrochemical redox switching provides clear temperature variations of the device when exposed to optical conditions resembling that of the cold night sky. Our results conclusively show that the observed variations in temperature are due to variations in radiative cooling. Thus, our study establishes a novel concept to dynamically tune a sustainable method to cool down objects via thermal radiation through the atmosphere and into cold space.

3:45pm - 4:00pm
ID: 146 / TOM7 S02: 4
TOM 7 Thermal radiation and energy management

Numerical simulations of the radiative properties of Al/air flames

Iñigo González de Arrieta1,2, Cédric Blanchard1, Fabien Halter3

1CNRS, CEMHTI UPR3079, Univ. Orléans, F-45071 Orléans, France; 2Physics Department, University of the Basque Country UPV/EHU, E-48940 Leioa, Spain; 3ICARE-CNRS, 1C Avenue de la Recherche Scientifique, Orléans, 45071, France

Aluminium microparticles have been proposed as a potential green energy vector, given their high energy density and the availability of clean recycling routes for the combustion products. Unfortunately, the phenomenology of micron-sized Al-air flames remains poorly understood. This contribution presents a new experimental setup and an optical model that can be used to study the fundamental properties of these flames, in order to design appropriate combustion systems. The radiative properties of the flame have been simulated by considering each burning Al particles as a core-shell particle, in which the cloud of condensed burning products is replaced with an effective medium. Emission from these alumina nanoparticles dominates the radiation profile and is required in order to better use pyrometric temperature measurements. This simplified model constitutes a starting point for more in-depth studies of heat transfer in Al/air flames.

4:00pm - 4:15pm
ID: 286 / TOM7 S02: 5
TOM 7 Thermal radiation and energy management

Mid-infrared narrowband polarization management with Al doped ZnO-ZnWO4 eutectic composites

Marco Centini1, Maria Cristina Larciprete1, Concita Sibilia1, Dorota A. Pawlak2

1Department of Basic and Applied Sciences for Engineering, SAPIENZA, University of Rome, Via A. Scarpa 16, 00161, Roma, Italy; 2ENSEMBLE3 sp. z o.o., Wolczynska 133, 01-919 Warsaw, Poland

We report a narrowband polarization-dependent reflectivity from Al-doped ZnO/ZnWO4 self-assembled eutectic composites in the mid-infrared range. Our results show a reflectivity modulation from 0.05 to 0.75 for two orthogonal polarizations of the incident field with a 10% Al concentration. Acting as natural polarizing filters these eutectic composites could open the way to the future development of low-cost photonics components in the IR.

2:30pm - 4:00pmTOM9 S02: Opto-electronic Nanotechnologies and Complex Systems: Ligth Matter inetraction
Location: B231
Session Chair: Emilija Petronijevic, Sapienza University of Rome, Italy
2:30pm - 3:00pm
ID: 343 / TOM9 S02: 1
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Light emission from color centers in phosphorus-doped diamond

Florian Sledz1, Assegid M. Flatae1, Stefano Lagomarsino1,2, Savino Piccolomo3, Shannon S. Nickley4,5, Ken Haenen4, Robert Rechenberg6, Michael F. Becker6, Silvio Sciortino2,7, Nicla Gelli2, Lorenzo Giuntini2,7, Giorgio Speranza3, Mario Agio1,8

1University of Siegen, Laboratory of Nano-Optics, 57072 Siegen, Germany; 2Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, 50019 Sesto Fiorentino, Italy; 3Fondazione Bruno Kessler, Centro Materiali e Microsistemi, 38122 Trento, Italy; 4Hasselt University & IMEC, Institute for Material Research (IMO) & IMOMEC, 3590 Diepenbeek, Belgium; 5University of Oxford, Department of Materials, Oxford OX1 2PH, United Kingdom; 6Fraunhofer USA, Center for Coatings and Diamond Technologies, East Lansing, MI 48824, USA; 7University of Florence, Departimento di Fisica e Astronomia, 50019 Sesto Fiorentino, Italy; 8National Research Council (CNR), National Institute of Optics (INO), 50125 Florence, Italy

Light emission from color centers in diamond is being extensively investigated for developing, among other quantum devices, single-photon sources operating at room temperature. By doping diamond with phosphorus, one obtains an n-type semiconductor, which can be exploited for the electrical excitation of color centers. Here, we discuss the optical properties of color centers in phosphorus-doped diamond, especially the silicon-vacancy center, presenting the single-photon emission characteristics and the temperature dependence aiming for electroluminescent single-photon emitting devices.

3:00pm - 3:15pm
ID: 316 / TOM9 S02: 2
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Tunable photoconductive devices based on graphene/WSe2 heterostructures

Hongyu Tang, Giulia Tagliabue

Laboratory of Nanoscience for Energy Technologies (LNET),EPFL, Switzerland

Optoelectronic tunability in van der Waals heterostructures is essential for their optoelectronic applications. In this work, tunable photoconductive properties were investigated in the heterostructures of WSe2 and monolayer graphene with different stacking orders on SiO2/Si substrates. Here, we demonstrated the effect of the material thickness of WSe2 and graphene on the interfacial charge transport, light absorption, and photoresponses. The results showed that the WSe2/graphene heterostructure exhibited positive photoconductivity after photoexcitation, while negative photoconductivity was observed in the graphene/WSe2 heterostructures. The tunable photoconductive behaviors provide promising potential applications of van der Waals heterostructures in optoelectronics. This work has guiding significance for the realization of stacking engineering in van der Waals heterostructures.

3:15pm - 3:30pm
ID: 297 / TOM9 S02: 3
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Field-enhancing tapered planarized waveguides for THz quantum cascade laser frequency combs

Urban Senica1, Andres Forrer1, Tudor Olariu1, Paolo Micheletti1, Sara Cibella2, Guido Torrioli2, Mattias Beck1, Jérôme Faist1, Giacomo Scalari1

1Quantum Optoelectronics Group, Institute of Quantum Electronics, ETH Zürich, Switzerland; 2Istituto di Fotonica e Nanotecnologie, CNR, Rome, Italy

We present a new planarized waveguide geometry for THz quantum cascade laser frequency combs with improved waveguide losses, RF and thermal dissipation properties. Ridge devices display broadband free-running comb states, and the THz emission can be further broadened by RF injection. Tapered waveguide devices feature a strong field-enhancement effect, which results in an improved comb performance. This includes free-running comb states with strong single beatnotes up to nearly -30 dBm at 90 K, almost three orders of magnitude stronger than for ridge devices. Improved comb operation is maintained also for high operating temperatures, up to 115 K.

3:30pm - 4:00pm
ID: 356 / TOM9 S02: 4
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Photonic metasurfaces for optical manipulation applications

Andrea Di Falco, Tomasz Plaskocinski

University of St Andrews, United Kingdom

Metasurfaces are versatile tools for controlling the behaviour of light through the exact control of light scattering at an interface. Here, we adopt the metasurface technology for optical manipulation applications, using their form factor and light-momentum engineering ability to enable new form of light-matter interactions. The resulting lab-on-chip platform offers unique advantages for biophotonic applications, including single molecule force spectroscopy and biological imaging.

4:00pm - 4:30pmCoffee Break
Location: Lunch & Coffee Tent
4:30pm - 6:00pmTOM1 S01: Silicon Photonics and Guided-Wave Optics
Location: B116
Session Chair: Pavel Cheben, NRC, Canada
4:30pm - 5:00pm
ID: 380 / TOM1 S01: 1
TOM 1 Silicon Photonics and Guided-Wave Optics

Subwavelength silicon nanostructuration for optomechanical applications

Carlos Alonso Ramos

CNRS, University Paris Saclay, France

Subwavelength silicon nanostructuration for optomechanical applications

5:00pm - 5:15pm
ID: 220 / TOM1 S01: 2
TOM 1 Silicon Photonics and Guided-Wave Optics

Bi-directional spectral broadening measurements for accurate characterisation of nonlinear hybrid integrated waveguides

Mikhail Dyatlov1,2, Philippe Delaye3, Laurent Vivien2, Nicolas Dubreuil1

1LP2N, Institut d’Optique Graduate School, CNRS, Université de Bordeaux, 33400 Talence, France; 2Université Paris-Saclay, CNRS, Centre de nanosciences et de nanotechnologies (C2N), 91120 Palaiseau, France; 3LCF, Institut d’Optique Graduate School, CNRS, Université Paris-Saclay, 91127 Palaiseau Cedex, France

The emerging interest in integrated optical technologies raises the need for precise characterisation techniques for waveguides presenting nonlinearities. Here we propose a non-interferometric measurement to accurately characterise the Kerr contribution in hybrid waveguides and illustrate its performances using SiN waveguides with a GSS chalcogenide top-layer. The sensitivity of our technique in terms of nonlinear phase reaches 10 mrad and its accuracy makes possible to extract the nonlinear contributions from the top-layer.

5:15pm - 5:30pm
ID: 148 / TOM1 S01: 3
TOM 1 Silicon Photonics and Guided-Wave Optics

Fabrication and optical characterization of erbium-doped silicon diode for quantum communication applications

Giulio Tavani1, Giorgia Franzò2, Michele Castriotta3, Giorgio Ferrari4, Francesco Picciariello5, Giulio Foletto5, Constantino Agnesi5, Paolo Villoresi5, Giuseppe Vallone5, Davide Rotta6, Chiara Barri1, Erfan Mafakheri7, Michele Celebrano4, Marco Finazzi4, Monica Bollani7, Enrico Prati8,9

1L-NESS, Dip. Di Fisica del Politecnico di Milano, I–22100 Como, Italy; 2CNR-IMM, Via Santa Sofia 64, I–95123 Catania, Italy; 3Dip. di Elettronica, Informazione e Bioingegneria, Politecnico di Milano, 20133 Milano Italy; 4Dip. di Fisica, Politecnico di Milano, I–20133 Milano Italy; 5Dip. di Ingegneria dell’Informazione, Università degli Studi di Padova, via Gradenigo 6B, IT-35131 Padova, Italy; 6InPhoTec, Integrated Photonic Technologies Foundation, I–56124 Pisa, Italy; 7IFN-CNR, L-NESS laboratory, 22100 Como, Italy; 8Istituto di Fotonica e Nanotecnologie, Consiglio Nazionale delle Ricerche, Piazza Leonardo da Vinci 32, I–20133 Milano, Italy; 9Dip. di Fisica “Aldo Pontremoli”, Università degli Studi di Milano, Via Celoria 16, I–20133 Milano, Italy

Quantum Key Distribution allows two users to exchange secret keys and it is based on the transmission of single photons or attenuated laser pulses. Recently, sources based on multiple single-photon emitters

were demonstrated to be suitable for QKD. Here, we present a CMOS compatible multiple single-photon emitters source realized on a SOI wafer by a standard silicon diode doped with erbium ions. Particular emphasis

is placed on the fabrication of such a device enhancing the erbium electroluminescence signal by adopting a

proper oxygen co-doping. Finally, electroluminescence characterization at room temperature of the device is


4:30pm - 6:00pmTOM11 S03: Tapered optical fibers, from fundamental to applications: Nanofiber component
Location: B031
Session Chair: Sylvie Lebrun, Laboratoire Charles Fabry, France
4:30pm - 5:00pm
ID: 354 / TOM11 S03: 1
TOM 11 Tapered optical fibers, from fundamental to applications

Bragg gratings and bio-bragg-gratings in tapered optical fibers

Martina Delgado Pinar, Antonio Díez, Jose Luis Cruz, Miguel V. Andrés

University of Valencia, Spain

Bragg Gratings and Bio-Bragg-Gratings in Tapered Optical Fibers

5:00pm - 5:15pm
ID: 227 / TOM11 S03: 2
TOM 11 Tapered optical fibers, from fundamental to applications

Nonlinear optical fiber couplers made of chalcogenide glass

Mohsen Rezaei1, Md Hosne Mobarak Shamim1, Mohammed El Amraoui2, Younes Messaddeq2, Martin Rochette1

1McGill University, Canada; 2Laval University, Canada

We demonstrate chalcogenide optical fiber couplers designed with a transmission spectrum response that varies with input power. The measured critical power is as low as 126 W at a wavelength of 1938 nm.

5:15pm - 5:30pm
ID: 156 / TOM11 S03: 3
TOM 11 Tapered optical fibers, from fundamental to applications

Optical nanofibers for signal delaying

Alexandre Matic, Adrien Godet, Jacques Chrétien, Kien Phan-Huy, Jean-Charles Beugnot

FEMTO-ST Institute, Université Bourgogne Franche-Comté, CNRS UMR 6174, 25030 Besançon, France

In this abstract, we purpose an optical delay line based on optical nanofibers. Silica high elasticity and the low pulling force required to stretch a nanofiber allow to get optical delays up to 20 picoseconds with a 10 centimeter-long optical nanofiber at telecommunications wavelength.

5:30pm - 5:45pm
ID: 133 / TOM11 S03: 4
TOM 11 Tapered optical fibers, from fundamental to applications

Experimental investigation of light-matter interaction when transitioning from cavity QED to waveguide QED

Daniel Lechner, Riccardo Pennetta, Martin Blaha, Philipp Schneeweiss, Jürgen Volz, Arno Rauschenbeutel

Humboldt University Berlin, Germany

Cavity quantum electrodynamics (cavity QED) is conventionally described by the Jaynes- or Tavis-Cummings model, where quantum emitters couple to a single-mode cavity. The opposite scenario, in which an ensemble of emitters couples to a single spatial mode of a propagating light field, is described by waveguide QED, where emitters interact with a continuum of frequency modes. Here we present an experiment where an ensemble of cold atoms strongly couples to a fiber-ring resonator with variable length containing an optical nanofiber. By changing the length of the resonator we can tailor the density of frequency modes and thus explore the transition from cavity QED to waveguide QED. We analyse the response of the ensemble--cavity system after the sudden switch-on of resonant laser light and find that for progressively longer resonators, the Rabi oscillations typical of cavity QED disappear and the single-pass dynamics of waveguide QED appear. Our measurements shed light on the interplay between the single-pass collective response of the atoms to the propagating cavity field and the ensemble--cavity dynamics.

4:30pm - 6:00pmTOM13 S03: Advances and Applications of Optics and Photonics
Location: B035
Session Chair: Susana Silva, INESC TEC, Portugal
4:30pm - 4:45pm
ID: 259 / TOM13 S03: 1
TOM 13 Advances and Applications of Optics and Photonics

Wavelength-switchable L-band fiber laser assisted by ultrafast laser fabricated random reflectors

Rosa Ana Perez-Herrera1,2, Pablo Roldan-Varona3,4,5, Arturo Sanchez-Gonzalez1,2, Luis Rodriguez-Cobo4, Jose Miguel Lopez-Higuera3,4,5, Manuel Lopez-Amo1,2

1Department of Electrical, Electronic and Communication Engineering, Public University of Navarra, 31006 Pamplona, Spain; 2Institute of Smart Cities (ISC), Public University of Navarra, 31006 Pamplona, Spain; 3Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain; 4CIBER-bbn, Instituto de Salud Carlos III, 28029 Madrid, Spain; 5Instituto de Investigacion Sanitaria Valdecilla (IDIVAL), 39005 Cantabria, Spain

A wavelength-switchable L-band erbium-doped fiber laser (EDFL) assisted by an artificially controlled backscattering (ACB) fiber reflector is here presented. This random reflector was inscribed by femtosecond (fs) laser direct writing on the axial axis of a multimode fiber with 50 µm core and 125 µm cladding with a length of 17 mm. This microstructure was placed inside a surgical syringe to be positioned in the center of a high-precision rotation mount to accurately control its angle of rotation. Only by rotating this mount, three different output spectra were obtained: a single wavelength lasing centered at 1574.75 nm, a dual wavelength lasing centered at 1574.75 nm and 1575.75 nm, and a single wavelength lasing centered at 1575.5 nm. All of them showed an optical signal-to-noise ratio (OSNR) of around 60 dB when pumped at 300 mW.

4:45pm - 5:00pm
ID: 135 / TOM13 S03: 2
TOM 13 Advances and Applications of Optics and Photonics

Scalar two-beam interference in spatial 2 by 2 unitary transformations

Atri Halder, Andreas Norrman, Jari Turunen, Ari T. Friberg

University of Eastern FInland, Finland

We study the evolution of several important physical quantities associated with scalar two-beam interference under 2 by 2 spatial unitary operations. In particular, we develop a geometrical framework to describe visibility, distinguishability, and concurrence, as well as their mutual connections and complementary features, in such transformations.

5:00pm - 5:15pm
ID: 175 / TOM13 S03: 3
TOM 13 Advances and Applications of Optics and Photonics

Detection of 3D coherence Stokes parameters with nanoscatterers

Mengwen Guo1,2, Andreas Norrman2,3, Ari T. Friberg2, Tero Setälä2

1Department of Physics, Hangzhou Dianzi University, Hangzhou 310018, China; 2Institute of Photonics, University of Eastern Finland, P.O. Box 111, FI-80101 Joensuu, Finland; 3Photonics Laboratory, ETH Zurich, CH-8093 Zurich, Switzerland

We present a method to probe the spectral coherence Stokes parameters of a random nonparaxial optical field by using two dipolar nanoscatterers. The method is based on observing the intensity and polarization-state fringes of the interfering scattered fields in the far zone. We show that all nine coherence Stokes parameters at the nanoparticles can be fully determined through measurements in three directions.

5:15pm - 5:30pm
ID: 242 / TOM13 S03: 4
TOM 13 Advances and Applications of Optics and Photonics

Extracting complex refractive indices from THz-TDS data with artificial neural networks

Nicholas Thomas Klokkou1, Jon Gorecki2, James Shafto Wilkinson1, Vasilis Apostolopoulos1

1University of Southampton, United Kingdom; 2Queen Mary University of London

Terahertz time-domain spectroscopy (THz-TDS) benefits from high signal-to-noise ratios (SNR), however extraction of material parameters involves a number of steps which can introduce errors into the final result. We present the use of artificial neural networks (ANN) as the first step to achieve a comprehensive approach for the extraction of the complex refractive index from THz-TDS data. The ANN shows performance superior to approximation methods and has a more straightforward implementation than root finding methods. Deep and convolutional neural networks are demonstrated to accept an entire frequency range at once, providing a tool for fitting where SNR is low, producing a more stable result.

5:30pm - 5:45pm
ID: 130 / TOM13 S03: 5
TOM 13 Advances and Applications of Optics and Photonics

Free convection along pumped active mirror amplifying medium and its impact on laser wave propagation

Hugo Chesneau, Sébastien Montant

Commissariat à l’Energie Atomique et aux Energies Alternatives, Centre d’Etudes Scientifiques et Techniques d’Aquitaine, F-33116 Le Barp, France.

Using COMSOL Multiphysics, we simulate free convection along a pumped active mirror amplifying medium. We study the induced boundary layers and how it affects the wave front propagation. To comfort our simulations, we set up a Mach-Zehnder interferometer to characterize and measure the local variation of air refractive index and temperature.

4:30pm - 6:00pmTOM2 S03: Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems: Applications
Location: B120
Session Chair: Andrew Robert Harvey, University of Glasgow, United Kingdom
4:30pm - 5:00pm
ID: 339 / TOM2 S03: 1
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Fiber endoscope using 3D printed diffractive optical elements for minimally invasive sensing and actuation in biomedicine

Juergen Czarske

Technische Universität Dresden, Germany

Minimally invasive fiber endoscopes are crucial for several applications. The memory effect of coherent fiber bundles is exploited with a diffractive optical element (DOE), printed on the fiber facet by 2-photon polymerization lithography. Results on 3D imaging without mechanical scanning will be presented.

5:00pm - 5:15pm
ID: 288 / TOM2 S03: 2
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Modelling dynamic 3D heat transfer in laser material processing based on physics informed neural networks

Jorrit Voigt, Michael Moeckel

University of Applied Sciences Aschaffenburg, Germany

Machine learning algorithms make predictions by fitting highly parameterized nonlinear functions to massive amounts of data. Yet those models are not necessarily consistent with physical laws and offer limited interpretability. Extending machine learning models by introducing scientific knowledge in the optimization problem is known as physics-based and data-driven modelling. A promising development are physics informed neural networks (PINN) which ensure consistency to both physical laws and measured data. The aim of this research is to model the time-dependent temperature profile in bulk materials following the passage of a moving laser focus by a PINN. The results from the PINN agree essentially with finite element simulations, proving the suitability of the approach. New perspectives for applications in laser material processing arise when PINNs are integrated in monitoring systems or used for model predictive control.

5:15pm - 5:30pm
ID: 345 / TOM2 S03: 3
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Sparse mid-infrared spectra enable real-time and in-vivo applications in tissue discrimination

Felix Fischer, Karsten Frenner, Alois M. Herkommer

Institute of Applied Optics, University of Stuttgart, 70569 Stuttgart, Germany

Differentiation of malign and benign tissue based on spectral information can be done by only using a small fractional amount of the original mid-infrared spectrum. An optimally selected arrangement of a few narrow-band quantum cascade lasers provides proficient signal-to-noise ratios and can drastically reduce the data acquisition time with constant discriminability, such that real-time applications will be possible in short-term and in-vivo diagnostics in the long-term.

5:30pm - 5:45pm
ID: 390 / TOM2 S03: 4
TOM 2 Computational, Adaptive and Freeform Optics - focus on Illumination, AR/VR and information driven systems

Synthetic wavelength holography in scattering media

Alexander Gröger

University of Stuttgart, Germany

Coherent detection enables the acquisition of amplitude and phase of optical fields. We use the synthetic wavelength as a computational construct arising from digital processing of two off-axis digital holograms to identify the structure of an object obscured by fog and further increase the imaging range due to the increased sensitivity in coherent detection. Experiments were carried out in a 27 m long fog tube filled with ultrasonically generated fog. Furthermore, we transfer the findings of this work to address the phase distortions in imaging through coherent fiber bundles (CFBs), which could enable distal shape measurement with ultrathin holographic endoscopy.

4:30pm - 6:00pmTOM3 S03: Optical System Design, Tolerancing and Manufacturing
Location: B032
Session Chair: Sven Schröder, Fraunhofer IOF, Germany
4:30pm - 5:00pm
ID: 303 / TOM3 S03: 1
TOM 3 Optical System Design, Tolerancing and Manufacturing

International and digital subsurface-damage-testing technologies laboratory

Jens Bliedtner1, Samson Frank1, Oliver Faehnle2, Heidi Cattaneo2

1Ernst-Abbe-University of Applied Sciences Jena, Germany; 2OST –Eastern Switzerland University of Applied Sciences Buchs, Switzerland

With the establishment of a versatile infrastructure for subsurface damages, a new interational laboratory has been established. For this purpose, researchers from the fields of optical metrology, optics technology, ophthalmology and computer science joined forces. A central research question and object of

object in the OpenLab are microcracks in optics

production, so-called subsurface damage. With the

ultra-high resolution and highly sensitive optical coherence

coherence tomography, a measuring principle based on white light principle based on white light interferometry, it will be possible to in glasses and ceramics with a resolution of 1 μm.

The laboratory is open to researchers and users to work together on topics related to SSD or to have measurement tasks carried out directly. The article presents the structure, the possibilities of cooperation and the goals of the open lab.

5:00pm - 5:15pm
ID: 309 / TOM3 S03: 2
TOM 3 Optical System Design, Tolerancing and Manufacturing

Improved production of large and multi-directional homogeneous optical glass: SCHOTT N-BK7® for challenging applications

Fabian Rupp, Ralf Jedamzik, Volker Dietrich, Uwe Petzold

SCHOTT AG, Germany

In many applications, the spatial refractive index variation – called homogeneity – within a measurement aperture either in one or two directions is important. Typical application examples are prisms in ultra-precision metrology with stability in multiple directions. Large lenses are used in artificial laser guide star systems for atmospheric correction in large telescopes. The challenge of enabling highest refractive index homogeneities requires tight control of all production steps from melting to hot forming and fine annealing. Large optical formats can be produced as singular castings in moulds up to 1.2 m in diameter and 250 mm thickness. Smaller formats are available as blocks produced in dimensions of approx. 250 x 250 x 180 mm3. A more economic and ecologic way is the production of continuous strips of glass up to approx. 500 mm width and 120 mm thickness. Recently SCHOTT has improved the homogeneity of these continuously produced jumbo strips significantly. Now homogeneity of up to H4 quality (2 ppm index maximum variation) can be provided on apertures up to approx. 900 mm x 500 mm. This paper gives an insight overview on the latest results and current state of this topic at the optical glass manufacturer SCHOTT.

5:15pm - 5:45pm
ID: 172 / TOM3 S03: 3
TOM 3 Optical System Design, Tolerancing and Manufacturing

Balancing your complexity budget

Sebastian Riese, Peter Zimmermann

LAYERTEC GmbH, Germany

The requirements for high-performance optics are continously increasing. This concerns optical requirements, e.g. for ultrafast optics, low-loss mirrors or high-power applications, and geometrical requirements alike, e.g. satisfying demanding spatial constraints or using free-form surfaces to reduce the number of required optics. As a result, substrate geometries and coatings grow more and more complex, posing challenges with respect to precision optics manufacturing, deposition technology and metrology as well as cost effectiveness.

LAYERTEC has addressed these kinds of challenges for more than 30 years. Proper communication of the required specifications is essential. Most importantly, the main properties of the optics have to be identified and mechanical, optical and coating engineering balanced accordingly. This is true for industry clients as well as research institutes, for high-volume fabrication or prototyping. Possible issues and lessons learned are presented.

5:45pm - 6:00pm
ID: 168 / TOM3 S03: 4
TOM 3 Optical System Design, Tolerancing and Manufacturing

Investigations on a novel process chain for manufacturing of freeform surfaces

Sebastian Henkel1, Christian Schulze1, Samson Frank1, Christoph Letsch1, Jens Bliedtner1, Thomas Arnold2, Heike Müller2, Edda Rädlein3

1Ernst-Abbe University of Applied Sciences Jena; 2Leibniz-Institut für Oberflächenmodifizierung e.V. (IOM); 3Technical University Ilmenau

Freeform optical surfaces have become increasingly important in recent years, as they can be used to construct optical assemblies with a reduced number of optical surfaces compared to systems without freeform surfaces, and thus optical systems can get more compact and lighter. However, the flexible and efficient production of precise optical freeform surfaces poses a major problem. This manifests itself in insufficient precision of the optics, long delivery times and high prices. It is shown, that ultrasonic grinding processes, combined with an ultra-fine grinding process and subsequent plasma jet polishing, are very well suited for the production of freeform optics and have a high technical and economic potential. Therefore, the aim is to validate an industrially suitable process chain based on this combination, in order to produce freeform optics of high accuracy (shape deviations <100 nm RMS) that can be manufactured in significantly fewer steps than before.

4:30pm - 6:00pmTOM4 S01: Bio-Medical Optics
Location: B325
4:30pm - 4:45pm
ID: 142 / TOM4 S01: 1
TOM 4 Bio-Medical Optics

Single-shot 3D endoscopic imaging exploiting a diffuser and neural networks

Julian Lich1, Tom Glosemeyer1, Jürgen Czarske1,2, Robert Kuschmierz1,2

1Laboratory of Measurement and Sensor Systems, TU Dresden, Germany; 2Competence Center for Biomedical Computational Laser Systems (BIOLAS), TU Dresden, Germany

Lens-based endoscopes offer high lateral resolution, but suffer from rigid imaging properties, such as a fixed focal plane. We present a miniaturized 0.5 mm diameter endoscope in which the objective lens is replaced by an optical diffuser. The intensity information of the object space is scattered and passed to a camera via a coherent fibre bundle. The image is reconstructed by a neural network. The field of view and resolution depend on the object distance. 3D-single-shot imaging up to video rate can be enabled. The approach shows great potential for applications like robust 3D fluorescence imaging.

4:45pm - 5:00pm
ID: 216 / TOM4 S01: 2
TOM 4 Bio-Medical Optics

Linearly modulated multi-focal diffractive lens for multi-sheet excitation of flow-driven samples in a light-sheet fluorescence microscope

Meike Hofmann1, Shima Gharbi Ghebjagh1, Chao Fan1, Yuchao Feng1, Karen Lemke2, Stefan Sinzinger1

1Technische Universität Ilmenau, Germany; 2Institut für Bioprozess- und Analysenmesstechnik Heiligenstadt, Germany

Light-sheet fluorescence microscopy (LSFM) with single light-sheet illumination enables rapid 3D-imaging of living cells. In this paper we show the design, fabrication and characterization of a diffractive optical element producing several light sheets along an inclined tube for applications in flow-driven imaging. The element, which is based on a multi-focal Fresnel zone plate and a linear grating, generates in combination with a refractive cylindrical lens five thin light sheets of equal intensity.

5:00pm - 5:15pm
ID: 271 / TOM4 S01: 3
TOM 4 Bio-Medical Optics

C-reactive protein detection using a lensless fibre optic fluorescence sensor

Victoria Esteso1,2, Pietro Lombardi1,2, Francesco Chiavaioli3, Maja Colautti1,2, Steffen Howitz4, Paolo Cecchi5, Mario Agio6, Ambra Giannetti3, Costanza Toninelli1,2

1CNR-INO, Italy; 2LENS, Italy; 3Istituto di Fisica Applicata "Nello Carrara", Italy; CNR-IFAC (Italy); 4GeSiM Gesellschaft fuer Silizium-Mikrosysteme mbH (Germany); 5Cecchi s.r.l. (Italy); 6Univ. Siegen (Germany)

Herein we show a prototype based on a lens-less fibre optic for fluorescence detection of labelled bio-assay which in this work it has been tested for early diagnosis of sepsis through detection of C-reactive protein (CRP) biomarker. In particular the rationalized optical design of the assay substrate allows to improve the coupling among the emitter and the optical fibre while enhancing the collection efficiency of the fluorescence signal for small numerical apertures. The prototype has been tested in a well-stablish and reproducible standard as it is the immunoglobuline IgG/Anti-IgG assay, reporting an enhancement above one order of magnitude compared to a commercial equipment. The limit-of-detection (LOD) achieved with this prototype for the CRP biomarker in matrices mimicking a real sample is in the clinically relevant range for early diagnosis of sepsis. These results demonstrate the validity of this prototype as an affordable, easy-to-use, compatible with micro-well arrays device for sepsis diagnosis ideal for hospital benches. Moreover, it can be extended to other biomarkers and fluid samples.

5:15pm - 5:30pm
ID: 400 / TOM4 S01: 4
TOM 4 Bio-Medical Optics

Physics-informed machine learning for microscopy

Emmanouil Xypakis1,2, Valeria deTuris1, Fabrizio Gala3, Giancarlo Ruocco1, Marco Leonetti1,2,4

1Center for Life Nano- and Neuro-Science, Istituto Italiano di Tecnologia, Viale Regina Elena 291, 00161, Rome, Italy; 2D-TAILS srl, 00161, Rome, Italy; 3Crestoptics S.p.A. (Italy); 4Soft and Living Matter Laboratory, Institute of Nanotechnology, Consiglio Nazionale delle Ricerche, 00185, Rome, Italy

We developed a physics-informed deep neural network architecture able to achieve signal to noise ratio improvement starting from low exposure noisy data. Our model is based on the nature of the photon detection process characterized by a Poisson probability distribution which we included in the training loss function. Our approach surpasses previous algorithms performance for microscopy data, moreover, the generality of the physical concepts employed here, makes it readily exportable to any imaging context.

4:30pm - 6:00pmTOM9 S03: Opto-electronic Nanotechnologies and Complex Systems: Novel effects I
Location: B231
Session Chair: Lucio Claudio Andreani, University of Pavia, Italy
4:30pm - 5:00pm
ID: 329 / TOM9 S03: 1
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Demonstration of Cognitive Bias on a Noisy Intermediate-Scale Quantum Processor

Fabio Antonio Bovino1, Alessandro Comi2

1Sapienza University of Rome, Italy; 2TIM S.p.A.

The decision-making process of the individual is analogous to the collapse of a quantum system at the moment of measurement, whereby quantum system we mean the decision-maker, his mental processes and the environmental context that influences him in his choices. Classical probability depends on the lack of information, quantum probability is instead intrinsic to the system to be studied, meaning that the system, consisting of the decision-maker and the context, is in a superposition of states, each with its own amplitude of probability. Only the measurement process (the decision) selects in the decision maker a specific state among those in which he was overlapping. We demonstrated on a Noisy Intermediate –Scale Quantum Processor the model of the “order effect”, one of the most important cognitive bias.

5:00pm - 5:15pm
ID: 236 / TOM9 S03: 2
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

THz frequency combs form dispersion-compensated antenna-coupled ring quantum cascade lasers

Paolo Micheletti1, Urban Senica1, Andres Forrer1, Sara Cibella2, Giudo Torrioli2, Mattias Beck1, Jerome Faist1, Giacomo Scalari1

1Institute of Quantum Electronics, Physics Department, ETH Zurich, Zurich, Switzerland; 2CNR-Istituto di Fotonica e Nanotecnologie, Rome, Italy

We report comb operation of RF injected ring Quantum Cascade Lasers. A coupled waveguide approach is implemented for dispersion compensation while passive bullseye antenna improves the device power extraction and far field. Phase sensitive measurements are presented which hints at the presence of soliton state.

5:15pm - 5:30pm
ID: 204 / TOM9 S03: 3
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Nature engineered metasurfaces: spin-to-orbital angular momentum conversion in diatom frustules

Edoardo De Tommasi, Maria Antonietta Ferrara, Giuseppe Coppola, Gianluigi Zito


Evolution provided, through eras, several animal, vegetal, and protist species with sub-micrometric constituent structures able to manipulate light at the nanoscale in non trivial ways. In particular, diatoms are single-celled microalgae enclosed in a porous silica shell, the frustule, perforated by regular patterns of micro- and nano-pores and whose functionalities comprise mechanical stability, sorting of nutrients from harmful agents and optimization of sunlight harvesting. Photonic properties of frustules include focusing, photoluminescence, and optical activity, among others. In the present work we show preliminary results concerning the ability of single valves of Arachnoidiscus ehrenbergii diatom frustules to manipulate incoming, circularly polarized radiation in such a way to generate light beams provided with orbital angular momentum (optical vortices). The combination of cross-polarization imaging in different spectral ranges, polarization sensitive digital holographic imaging (PSDHI), and interferometry allowed characterizing the valves and detecting the presence of spin-orbit coupling induced by their ultrastructure.

6:00pm - 8:00pmEPIC-EOS: Joint industrial optics podium session and Welcome reception
Location: Auditorium

Join the EPIC-EOS joint podium discussion on industrial optics!
The session is chaired by Antonio Castelo, Technology Manager at EPIC, and Oliver Fähnle, Industrial Chair of EOS.

We welcome all conference participants to this special session followed by a welcome cocktail reception for enhancing and creating contacts. Be there!

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