Conference Agenda

Session Overview
Location: B120
1st floor, 70 seats
Date: Monday, 12/Sept/2022
1:00pm - 2:30pmTutorial Alpao: Julien Charton
Location: B120

Title: Hands-on approach to adaptive optics: wavefront sensors, deformable mirrors and control methods

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3:00pm - 4:30pmTutorial Holger Schmidt
Location: B120

Title: Optofluidics for single molecule analysis: From photonic innovation to applications

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5:00pm - 6:30pmTutorial Gilberto Brambilla
Location: B120

Title: Optical microfibre devices and sensors

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Date: Tuesday, 13/Sept/2022
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.

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.

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.


Date: Wednesday, 14/Sept/2022
9:00am - 10:30amTOM5 S01: Resonant Nanophotonics
Location: B120
Session Chair: Nicolas Bonod, CNRS, France
9:00am - 9:30am
ID: 372 / TOM5 S01: 1
TOM 5 Resonant Nanophotonics


Magnus Jonsson

Linköping University, Sweden


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

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

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

Institute of Photonics, University of Eastern Finland, Finland

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

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

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

Dominik Beutel, Carsten Rockstuhl, Ivan Fernandez-Corbaton

Karlsruhe Institute of Technology, Germany

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

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

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

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

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

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

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

Tailoring magnetic dipole emission by broken-symmetry TiO2 metasurfaces

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

Friedrich Schiller University Jena, Germany

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

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


Aitzol Garcia Etxarri

Donostia International Physics Cente, Spain


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

Dynamics of the optical forces in nanosystems

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

Swiss Federal Institute of Technology Lausanne (EPFL), Switzerland

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

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

Nanohybrid architectures for strong light-matter interaction

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

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

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

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

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

Jayeeta Amboli1, Guillaume Demesy1, Bruno Galas2, Nicolas Bonod1

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

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

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


Humeyra Caglayan

Tampere University, Finland


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

Controlling resonant surface modes by arbitrary light induced optical anisotropies

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

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

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

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

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

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

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

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

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

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


Sebastien Bidault

Institut Langevin, ESPCI Paris, CNRS, France



Date: Thursday, 15/Sept/2022
8:30am - 10:00amTOM5 S04: Resonant Nanophotonics
Location: B120
Session Chair: David Hunger, Karlsruhe Institute of Technology, Germany
8:30am - 9:00am
ID: 370 / TOM5 S04: 1
TOM 5 Resonant Nanophotonics

Bio-inspired polaritons: resonant photonics with organic matter.

Carla Estévez-Varela1, Miguel Augusto Castillo2, Martin Lopez-Garcia2, Isabel Pastoriza-Santos1, Sara Núñez-Sánchez1

1Functional NanoBioMaterials Group, CINBIO-University of Vigo, Vigo, Spain; 2Natural and Artificial Photonic Structures Group, International Iberian Nanotechnology Laboratory, Braga, Portugal

Photosynthesis is a phenomenon that has fascinated humanity from ancient times. The complexity of the natural photosynthetic structures and their molecular components makes it difficult to work out the mechanism that governs their efficiency. Under this complexity, there are structural rules with molecular spatial distributions at the nanoscale repeated between different photosynthetic life entities, such as bacteria or plants. In this seminar, I will introduce a revolutionary organic platform inspired by compact molecular distributions of photosynthetic complexes which can be exploited to transport photon energy/information through polaritonic optical excitations. I will continue explaining to you our results by applying them to self-standing polymer photonic structures inspired by photosynthetic organelles. Finally, I will show our last results simulating real photosynthetic organelles at the nanoscale which will lead us to an open question: can be natural organelles using polaritonic resonances at the nanoscale achieve these extraordinary efficiencies?

9:00am - 9:15am
ID: 124 / TOM5 S04: 2
TOM 5 Resonant Nanophotonics

Dark-field scanning Hyperspectral imaging of SiGe dewetted Mie resonator

Luca Fagiani1,2, Nicoletta Granchi3, Marco Salvalaglio5,6, Chiara Barri1,2, Andrea Ristori3, Michele Montanari3, Massimo Gurioli3, Marco Abbarchi4, Axel Voigt5,6, Francesca Intonti3, Maria Antonietta Vincenti7, Monica Bollani2

1Department of Physics, Politecnico di Milano, Milano, Italy; 2Institute of Photonic and Nanotechnology - Consiglio Nazionale delle Ricerche, LNESS laboratory, Como, Italy; 3LENS and Department of Physics and Astronomy, University of Florence, Sesto Fiorentino, Italy; 4Aix Marseille Univ, Université de Toulon, CNRS, IM2NP Marseille, France; 5Institute of Scientific Computing, TU Dresden, Dresden, Germany; 6Dresden Centre for Computational Materials Science (DCMS), TU Dresden, Dresden, Germany; 7Department of Information Engineering, University of Brescia, Brescia, Italy

All-dielectric, sub-micrometric particles obtained through solid state dewetting support Mie resonances together with a high quality monocrystalline composition. Although the scattering properties of these systems have been qualitatively investigated, a precise study on the impact given by the effective complex morphology of a dewetted nanoparticle to the Mie scattering properties is still missing. In this work, by using morphological characterization, phase field modelling and light scattering simulation, we provide a realistic overview of the single scatterer optical properties. Dark-field Scanning Hyperspectral Imaging experiments are then performed, for the first time, allowing to map in real space the distribution of multipolar modes and to reconstruct the scattering pattern also at angles wider than the numerical aperture of conventional microscope objective lenses. We find an excellent agreement between the experimental and theoretical scattering cross-sections.

9:15am - 9:30am
ID: 252 / TOM5 S04: 3
TOM 5 Resonant Nanophotonics

Exploring subradiant optical modes in subwavelength arrays of quantum emitters

María Blanco de Paz1,2, Alejandro González-Tudela3, Paloma A. Huidobro2

1Instituto de Telecomunicações, Portugal; 2Donostia International Physics center, Spain; 3Institute of Fundamental Physics, Spain

We studied the optical response of quantum metasurfaces consisting in quantum emitters arranged as non-Bravais lattices. Reducing the symmetries of the system by tuning either the lattice or the quantum emitters we are able to access new types of light matter interactions, such as the quasi-bound states in the continuum and exotic Dirac dispersions.

9:30am - 9:45am
ID: 302 / TOM5 S04: 4
TOM 5 Resonant Nanophotonics

Figure of merit comparison between Surface Plasmon Resonance and Bloch Surface Waves

Bernardo Dias1,2, José M. M. de Almeida1,3, Luís C. C. Coelho1,2

1INESC-TEC, Portugal; 2Department of Physics and Astronomy, Faculty of Sciences, University of Porto; 3Department of Physics, School of Science and Technology, University of Trás-os-Montes e Alto Douro

The sensing performance of two types of electromagnetic surface waves are compared, a Surface Plasmon Polariton, where a gold thin film is used, being a standard material in biosensing applications; and a Bloch Surface Wave, using a photonic crystal made of a stack of silica and titanium dioxide layers. It is verified that the sensing performance (as measured by the Figure of Merit) of the gold film is higher, even though the Bloch Surface Waves can serve specific applications due to its narrow bandwidth. At the same time, it is concluded that further research must be made in order to choose the right set of parameters that maximize the Bloch Surface Wave performance.


Date: Friday, 16/Sept/2022
8:30am - 10:00amESRS: Early Stage Researcher Session
Location: B120
Session Chair: Baptiste Bruneteau, Teem Photonics, France
Session Chair: Isaac Doughan, University of Eastern Finland, Finland

This session is specially designed for participants in the first four years (full-time equivalent research experience) of their research careers and who have not been awarded a doctoral degree. We encourage PhD students to express their ideas and describe their scientific achievements to the conference audience.

ID: 276 / ESRS: 1
Early Stage Reserch Session

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

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

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

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

ID: 409 / ESRS: 2
Early Stage Reserch Session

Chip integrated photonics for ion based quantum computing

Steffen Sauer

TU Braunschweig, Germany

Ion traps are a promising platform for the realisation of high-performance quantum computers. To enable the future scalability of these systems, integrated photonic solutions for guiding and manipulating the laser light at chip level are a major step. Such passive optical components offer the great advantage of providing beam radii in the μm range at the location of the ions without increasing the number of bulk optics. Different wavelengths, from UV to NIR, as well as laser beam properties, such as angle or polarisation, are required for different cooling and readout processes of ions.

We present simulation results for different optical photonic components, such as grating outcouplers or waveguide splitters and their applications on ion trap chips. Furthermore, we will introduce the experimental setup for the optical characterisation of the fabricated structures.

ID: 408 / ESRS: 3
Early Stage Reserch Session

Hybrid polymer-titania waveguides for highly integrated circuits

Isaac Doughan

University of Eastern Finland, Finland

Highly integrated photonic circuitry is facing challenges when considering low-cost manufacturing and low-power consumption devices [1]. Current silicon photonic platforms (Si, Si3N4, SiO2...) are providing efficient solutions but are not always versatile or compatible with applications requiring broadband operations such as sensing for instance. The main waveguide-based sensing mechanism relies on the probing of the outer medium with the evanescent tail of the guided mode. To obtain a high limit of detection together with high sensitivity, the overlap between the analyte and the evanescent tail of the mode must be increased as well as the length of the waveguide, which yields an increase of the footprint of the device and the propagation losses. Double spiral waveguides are heavily used for waveguide sensing, providing interaction length of several centimeters.

ID: 406 / ESRS: 4
Early Stage Reserch Session

Managing the beam profile of a low spatial coherence high-power diode laser for gain material pumping

Thomas Dubé


We report a spatial profile management method that allows us to homogenize and shape a beam emitted from a high-power diode stack used as a pump source in high-power laser front-end amplifiers. It is based on imaging the far-field profile produced by propagating the diode beam through an engineered diffuser.

ID: 407 / ESRS: 5
Early Stage Reserch Session

Towards a deterministic single atom trap in the evanescent field of a Whispering-Gallery-Mode resonator

Gabriele Maron

Humboldt Universität, Germany

Whispering-gallery-mode (WGM) resonators are monolithic structures that guide light by total internal reflection, and exhibit ultra-high Q factors in combination with a small optical mode volume. They provide lossless in- and out-coupling of light via tapered optical fibers, and allow one to reach the strong coupling regime of cavity-QED when coupling a single atom to their evanescent field. Furthermore, these resonators exhibit chiral (i.e. direction dependent) light-matter interaction, which makes them attractive atom-photon interfaces for novel quantum information processing devices.

ID: 410 / ESRS: 6
Early Stage Reserch Session

Towards Kerr micro-comb generation in tantalum pentoxide micro-resonators

Jake Daykin

University of Southampton, United Kingdom

We present the design, fabrication, simulation, and initial characterisation of tantalum pentoxide

(Ta2O5) optical waveguides and micro-ring resonators for the purpose of supercontinuum and frequency comb


We use Ta2O5 sputtered on oxidised silicon wafers as a wave-guiding layer. Ta2O5 presents a number of advantages over other commonly used materials in integrated photonics. The linear refractive index of Ta2O5 is similar to that of Si3N4 at 1550 nm, and the nonlinear refractive index of Ta2O5 has been reported to be a factor of 3 greater than that of stoichiometric Si3N4 and an order of magnitude greater than of Si, suggesting that Ta2O5 is an interesting material for the generation of Kerr frequency combs. Additionally, Ta2O5 can be doped with rare-earth elements, such as Er, Nd and Yb, which allows for the creation of waveguide lasers.

ID: 157 / ESRS: 7
Early Stage Reserch Session

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

Valeriia Bobkova (Ahlborn)1, Eileen Otte2,3, Sarah Trinschek4, Cornelia Denz1

1University 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 complements and therefor extend the existing conventional tools for the investigation of the droplets formed on liquid-repelling surfaces.