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 and polymers, syntheses, characterization and devices
TOM 7 - Thermal radiation and energy management
TOM 8 - Nonlinear and Quantum Optics
TOM 9 - Optics at Nanoscale (ONS)
TOM 10 - Optical Microsystems (OMS)
TOM 11 - Waves in Complex Photonic Media
TOM 12 - Optofluidics
TOM 13 - Ultrafast Optical Technologies and Applications
TOM 14 - Advances and Applications of Optics and Photonics
EU Project Session
Early Stage Researcher Session organised by SIOF
Grand Challenges of Photonics 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 detailed view (with abstracts and downloads when you are logged in as registered attendee). Plenary speeches, tutorials, and Early Researcher session will be updated very soon. Thank you for your patience!

Session Overview
Wednesday, 15/Sept/2021:
13:45 - 15:00

Location: Sala de Chiostro

1st Floor

ID: 335
TOM 14 Advances and Applications of Optics and Photonics

Accommodative lag by open-field autorefraction and Hartmann-Shack aberrometer

Jessica Gomes, Kishor Sapkota, Patrícia Nogueira, Sandra Franco

Centre of Physics, University of Minho, Portugal

The purpose of the present study was to compare an open-field autorefractor (AR) and an aberrometer for measuring the ocular accommodative lag. The measurements were. It was found higher accommodative lags when measured it with the AR specially for high accommodative stimuli. However, the differences in accommodative lag between the two instruments were not statistically significant (p >0,05) and were under the limits of agreement The results indicate that aberrometer may be used for measuring the accommodative lag and may be more efficient for measuring accommodative lag for high accommodative stimuli.

ID: 206
TOM 14 Advances and Applications of Optics and Photonics

Propagation features of a class of beams radiated from pseudo-Schell model vectorial sources

Rosario Martínez-Herrero1, Gemma Piquero1, Juan Carlos G. de Sande2, Massimo Santarsiero3, Franco Gori3

1Universidad Complutense de Madrid, Spain; 2Universidad Politécnica de Madrid, Spain; 3Università Roma Tre

Here we study the propagation features of a class of beams radiated from sources of the pseudo Schell-model type endowed with a vectorial nature. The polarization pattern and the degree of polarization are not uniform across the beam section but remain invariant upon free paraxial propagation. On the other hand, their coherence and irradiance features are also non-uniform but in this case they change at each z-plane. The field characteristics can be varied on acting on the free parameters of the cross-spectral density matrix of the source.

ID: 207
TOM 3 Optical System Design, Tolerancing and Manufacturing

Investigation of the influence of plasma source power on the properties of magnetron sputtered Ta2O5 thin films

Manuel Bärtschi1,3, Daniel Schachtler1, Silvia Schwyn-Thöny2, Valentin J. Wittwer3, Thomas Südmeyer3, Roelene Botha1

1RhySearch, Switzerland; 2Evatec AG, Switzerland; 3Université de Neuchâtel, Switzerland

To enable the production of sophisticated optical interference coating designs, coatings with low absorption and stray light losses and excellent layer thickness deposition accuracy are required. The selection and optimization of suitable coating materials and deposition processes are consequently essential. In this study, the influence of the plasma source power on the optical properties, layer uniformity and stress, scattered light behaviour and optical losses of magnetron sputtered Ta2O5 thin films was investigated. A high reflectivity mirror of SiO2 and Ta2O5 was then deposited in order to test the optimized parameters.

ID: 314
TOM 3 Optical System Design, Tolerancing and Manufacturing

What can optical engineers learn from Leonardo

Oliver Faehnle1, Irina Livshits2

1OST University of Applierd Sciences; 2ITMO University, St.Petersburg, Russia

see attached file

ID: 226
TOM 6 Optical Materials: crystals, thin films, organic molecules and polymers, syntheses, characterization and devices

Thermal stress-induced depolarization reduction using a near-c cut birefringent crystal geometry

Michael Eichenberger1, Justinas Pupeikis1, Benjamin Willenberg1, Abdelmjid Benayad2, Patrice Camy2, Christopher Phillips1, Ursula Keller1

1ETH Zurich, Switzerland; 2CIMAP, University of Caen, France

We demonstrate a thermal depolarization imaging system which measures spatially-resolved losses as low as 5∙10-3 %. We compare different gain materials, and show that a 25°-cut Yb:CALGO crystal exhibits minimal depolarization while supporting near-symmetric gain properties.

ID: 489
TOM 6 Optical Materials: crystals, thin films, organic molecules and polymers, syntheses, characterization and devices

Proton-induced damage in ALD-deposited Al2O3 thin films for space applications: dependence on substrate material

Anna Sytchkova1, Paolo Olivero2, Maria Lucia Protopapa3, Zicai Shen4, Zhihao Wang5, Kaixin Zhang5, Yanzhi Wang5, Emiliano Burresi3, Martino Palmisano3, Emanuela Pesce3, Hongbo He5

1Enea Casaccia, Italy; 2University of Torino, Italy; 3Enea Brindisi, Italy; 4BISEE, China; 5SIOM, China

A theoretical and experimental study is reported on the impact of low-energy protons on the optical properties of Al2O3 coated fused silica disks and crystalline silicon wafers manufactured by ALD technique. The effect of the proton irradiation resulted different for the two types of samples.

ID: 369
TOM 6 Optical Materials: crystals, thin films, organic molecules and polymers, syntheses, characterization and devices

Singlet heterofission in tetracene-pentacene thin-film blends

Luca Moretti1, Clemens Zeiser2, Daniel Lepple2, Margherita Maiuri1, Giulio Cerullo1, Katharina Broch2

1Dipartimento di Fisica, Politecnico di Milano, Leonardo da Vinci 32, Milan, Italy; 2Institute for Applied Physics, University of Tübingen, Tübingen, Germany

Heterofission, the photophysical process converting a singlet state into two triplets on chemically distinct chromophores, has fundamental and applied interest, offering great potential in tuning the optical bandgap and the splitting between singlet and triplet energies. We report the time-domain investigation of singlet relaxation in thin films blends of prototypical singlet fission chromophores pentacene and tetracene. We confirm the presence of endothermic heterofission from pentacene in blends with 5% pentacene fractions, with a time constant of 26 ps, which is instead outcompeted by pentacene homofission for higher pentacene concentrations.

ID: 302
TOM 6 Optical Materials: crystals, thin films, organic molecules and polymers, syntheses, characterization and devices

Ionic liquids as tunable refractive index fluids

Carlos Damián Rodríguez Fernández1, Elena López-Lago1, Christian Schröder2, Luis M. Varela1

1Universidade de Santiago de Compostela, Spain; 2University of Vienna, Austria.

In this contribution we simulate the refractive index of a large number of ionic liquids. The results

show that their structural tunability can be exploited to successfully design ionic liquids with task-specific refractive indices over a wide range of values, even higher than 2.0. Some designing clues are provided, being charge delocalization and the presence of fluorine atoms the key factors to reach ion combinations with the highest refractive index possible.

ID: 468
TOM 6 Optical Materials: crystals, thin films, organic molecules and polymers, syntheses, characterization and devices

Computation of light absorption in clustered InGaN alloys with the Wigner-Weyl-localization-landscape model

Jean-Philippe Banon1, Pierre Pelletier1, Svitlana Mayboroda2, Marcel Filoche1

1Laboratoire de Physique de la Matière Condensée (PMC), CNRS, Ecole polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France; 2School of Mathematics, University of Minnesota, Minneapolis, Minnesota 55455, USA

We study light absorption in clustered InGaN alloys with a recently developed model based on an approach in phase space and the localization landscape. The model was shown to give reliable results at low computational cost for uncorrelated disordered InGaN alloys when compared with a rigorous model based on the computation of the electronic eigenstates of the Hamiltonian in the effective mass approximation. In the present work, we study the influence of clustering on the absorption coefficient and show that the Urbach tail is particularly sensitive the typical cluster size.

ID: 440
TOM 9 Optics at Nanoscale (ONS)

Elliptical nanohole arrays for tuneable chiral visible light emission

Emilija Petronijevic, Ramin Ghahri, Concita Sibilia

Sapienza University of Rome, Italy

We numerically study chirality in elliptical nanohole arrays (ENHA). We show circular dichroism in absorption of Au- and Ag-ENHA, and we extend its use to the emission. Starting from ENHA embedded in glass, we study their broadband circular dichroism in the absorption, by exciting them with plane waves. Next, we investigate ENHA coupled to a thin emitting layer, embedded in the glass above the ENHA. We show chirality in the emission by an ensemble of homogeneous, randomly oriented electric dipoles, which can be tuned by the excitation polarization and wavelength.

ID: 465
TOM 9 Optics at Nanoscale (ONS)

Luminescence properties of chiral molecules induced by circular polarised light

Alessandro Belardini, Emilija Petronijevic, Ramin Ghahri, Fabiana Pandolfi, Daniele Rocco, Leonardo Mattiello, Concita Sibilia

Sapienza Università di Roma, Italy

Here we show that the luminescence emission properties of chiral molecules depend on the polarisation state of the pumping light. Two new enantiomeric molecules were synthesized and solutions of them at different concentrations were measured under opposite circular polarisation states of pumping light, leading to a circular dichroic behaviour of the luminescence emission.

ID: 284
TOM 9 Optics at Nanoscale (ONS)

Microstructuring of Metal-Insulator-Metal nanocavities for spatial Epsilon-Near-Zero response

Renuka Devi Pothuraju1,2, Lyuye Lin1,2, Roman Krahne1

1Istituto Italiano di Tecnologia, Italy; 2Università degli Studi di Genova, Italy

Metal-Insulator-Metal (MIM) nanocavities exhibit Epsilon-Near-Zero (ENZ) resonances when the thickness of the dielectric layers is sufficient to sustain photonic modes. The ENZ frequencies depend on the thickness of the dielectric layer, and can be tuned throughout the entire visible range. In this work, we pattern MIM cavities laterally to obtain a GRATING MIM with spatial heterogeneous response caused by the different ENZ modes. With COMSOL simulations we determine the geometric limit to obtain ENZ response without lattice interference. The optical response of the Grating MIM is investigated with spectroscopic ellipsometry

ID: 165
TOM 13 Ultrafast Optical Technologies and Applications

Novel ultrafast dynamics of double-frequency breathing-like dissipative solitons

Katarzyna Krupa1, Tomasz Kardas2, Yuriy Stepanenko1

1Institute of Physical Chemistry Polish Academy of Sciences, Poland; 2Fluence sp. z o.o.

We report experimental evidence of a new type of double-frequency breathing-like dynamics in all-PM Ytterbium-doped fiber laser that can be understood as a Hopf-Hopf bifurcation. The breathing frequency is oscillating with an increasing amplitude when pump power grows larger until a stationary dissipative soliton is formed. We discuss the possible explanation of the observed Hopf-Hopf bifurcation dynamics.

ID: 175
TOM 13 Ultrafast Optical Technologies and Applications

Modeling femtosecond pulse propagation and high harmonics generation in hollow core fibers

Valer Tosa1, Salvatore Stagira2, Rebeca Martinez Vazquez3, Caterina Vozzi3, Anna Gabriella Ciriolo2,3

1National Institute for R&D Isotopic and Molecular Technologies, Cluj-Napoca, Romania; 2Politecnico di Milano, Physics Department, Milano, Italy; 3Institute for Photonics and Nanotechnologies (IFN), National Research Council (CNR), Milano, Italy

One way to increase the well known low efficiency of high order harmonics generation is to place the gas medium in a hollow core waveguide. The numerical model used to obtain driving and harmonics field configuration along and across the waveguide was developed in an arbitrary gas density profile and arbitrary fiber diameter modulation. We analyse the influence of the fiber diameter modulation which result from the fabrication process on both pulse propagation and on harmonic generation.

ID: 177
TOM 13 Ultrafast Optical Technologies and Applications

Ultrafast Bessel beams for micromachining of transparent materials

Ottavia Jedrkiewicz1, Valeria V Belloni2, Shane M Eaton3, Monica Bollani4, Paolo Di Trapani5

1Istituto di Fotonica e Nanotecnologie, CNR, Como (Italy); 2FEMTO-ST Institute, University Bourgogne Franche-Comté (France); 3Istituto di Fotonica e Nanotecnologie, CNR, Milano (Italy); 4Istituto di Fotonica e Nanotecnologie, CNR, L-NESS, Como (Italy); 5Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, Como (Italy)

We review the advantages of using finite energy ultrafast Bessel beams for laser micromachining of dielectrics. Different Bessel beam microfabrication results and applications are presented, ranging from the generation of elongated tailored microstructures and microchannels in thick glasses or polymers, the generation of graphitic wires in diamond, the etching and drilling of strong transparent materials, up to the surface micromachining of diamond for microfluidics and biosensing applications.

ID: 211
TOM 13 Ultrafast Optical Technologies and Applications

Optical instabilities in Fabry-Perot resonators

Franco Prati, Andrea Bassi, Luigi Lugiato

Università dell'Insubria, Italy

We study the singlemode and multimode instabilities of a free running Fabry-Perot laser in the frameowrk of the exact Maxwell-Bloh equations for a resonant two-level laser. Considering a doubled cavity we use a traveling wave formalism

and analyze amplitude and phase instabilities obtaining exact analytic expressions for the instability thresholds. We study numerically the self-pulsing regimes that arise form the instabilities. The analyis of the singlemode instability

confirms that in a resonant Fabry-Perot laser it arises only very far from threshold.

ID: 217
TOM 13 Ultrafast Optical Technologies and Applications

Dispersion-tailoring and spectral filtering of a NALM-based all-PM Er-doped pulsed fiber laser operating in net-normal dispersion regime

Zbigniew Łaszczych, Grzegorz Soboń

Laser & Fiber Electronics Group, Wrocław University of Science and Technology, Poland

We present an experimental study on the performance of an all-polarization maintaining Er-doped mode-locked laser operating in a net-normal dispersion regime. The tuning of the bandwidth of an intra-cavity filter led to the observation of three distinctive states of pulsed operation. Depending on the filter width, pumping power, and net cavity dispersion, we were able to obtain pulses of several ps duration with energies up to 0.3 nJ.

ID: 220
TOM 13 Ultrafast Optical Technologies and Applications

All-fiber amplification system of spectrally-compressed soliton pulses tunable in the 1600-1800 nm wavelength range

Olga Szewczyk, Zbigniew Łaszczych, Grzegorz Soboń

Wrocław University of Science and Technology, Poland

We demonstrate an all-fiber narrow-linewidth laser source tunable in the 1600-1800 nm wavelength range. The system exploits a spectral compression technique that allows for narrowing the bandwidth of the frequency-shifted solitons from 21.4-24.6 nm to 0.49-2.86 nm. The shifted spectrally-compressed solitons are then amplified in a Tm-doped amplifier resulting in output powers up to 446 mW for the wavelength range 1684-1825 nm. We believe that such source would meet the requirements of the OCT imaging.

ID: 242
TOM 13 Ultrafast Optical Technologies and Applications

Generation of ultrashort pulses in a self-starting mode-locked Thulium-doped fiber Mamyshev oscillator

Benedikt Schuhbauer1, Veronika Adolfs1, Andreas Wienke1, Jörg Neumann1,2, Dietmar Kracht1,2

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

We present a self-starting mode-locked ultrafast Thulium-doped fiber Mamyshev oscillator. The generation of pulses from the quantum noise was achieved by hybrid mode-locking associated with the nonlinear polarization evolution inside the fiber sections. The oscillator emitted ultrashort pulses with 35.3 nm wide spanning optical spectra, which could be compressed close to their transform limit.

ID: 243
TOM 13 Ultrafast Optical Technologies and Applications

Spectral broadening and post compression of millijoule picosecond pulses at 2 μm in a hollow core capillary

Tobias Flöry, Ignas Astrauskas, Paolo Carpeggiani, Andrius Baltuska, Audrius Pugzlys

Photonik Institut, TU Wien, Austria

We present results from spectral broadening of 4.6 mJ picosecond-pulses from a Ho:YAG regenerative amplifier at 2.09 μm in a hollow core capillary. The spectrally broadened pulses are recompressed using a reflective grating compressor.

ID: 256
TOM 13 Ultrafast Optical Technologies and Applications

Methane in ultrashort 400nm and 800nm laser fields

Lazaros Varvarezos1, John Costello1, Conor Long2, Rene Wagner3, Michael Meyer3, Patrik Grychtol3

1Dublin City University, School of Physical Sciences and NCPST, Dublin 9, Ireland; 2Dublin City University, School of Chemical Sciences, Dublin 9, Ireland; 3European XFEL GmbH, Small Quantum Systems Group, 22869 Schenefeld, Germany

The effect of laser wavelength on the dissociation mechanisms in methane is examined over a broad range of intensities for both 800 nm and 400 nm femtosecond laser fields. It is found at lower laser intensities that the dissociation pathways identified with the aid of theoretical calculations for the methane cation can account for most of the experimental findings, including the differences observed for irradiation by 800 nm and the 400 nm fields.

ID: 297
TOM 13 Ultrafast Optical Technologies and Applications

Single-shot interferometry for Fourier transform electronic spectroscopies without phase-stable setups

Aaron Christopher Riede, Andrea Cannizzo

Insititute of Applied Physics, University of Bern, Switzerland

We present a novel approach for coherent electronic spectroscopies based on single shot detection of interferograms generated with femtosecond pulses. In combination with a simultaneous, interferometric phase measurement, the extensive effort for phase stabilization and attosecond delay control can be reduced tremendously. We can determine the differential phase between two pulses with a precision of 15 as and in addition to that prove, that heterodyne detection is possible in non-phase stable setups.

ID: 307
TOM 13 Ultrafast Optical Technologies and Applications

Reconstruction of few-fs xuv pulses with a perturbative approach

Bruno Moio1,2, Fabio Medeghini1,2, Gian Luca Dolso1, Giacomo Inzani1, Nicola Di Palo1,2, Rocío Borrego-Varillas2, Mauro Nisoli1,2, Matteo Lucchini1,2

1Department of Physics, Politecnico di Milano, 20133 Milano, Italy; 2Institute for Photonics and Nanotechnologies, IFN-CNR, 20133 Milano, Italy

A precise temporal characterization of the pulses involved in pump-probe experiments is crucial for a proper investigation of the ultrafast dynamics. In the few-fs/attosecond domain, typical reconstruction procedures require time-consuming interative methods. We use a simplified approach, called Simplified Trace Reconstruction In the Perturbative regimE (STRIPE), with no need for a phase retrieval algorithm. Our method is much faster than the other currently in use and allows for including the experimental non-idealities that may affect the measurement.

ID: 325
TOM 13 Ultrafast Optical Technologies and Applications

From CPA to MPC: a novel pulse compressor for 10s to 100s PW lasers

Jun Liu

Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China, People's Republic of

Pulse compressor became the main obstacle on achieving10s to 100s PW lasers . Here, a novel multistep pulse compressor (MPC) method is proposed to increase the maximum bearable pulse energies through modifying their spatiotemporal properties. Typically, the MPC including a pre-compression, a main compression, and a post-compression. As a result, as high as 100 PW laser can be compressed with single beam. Together with the multi-beam tiled-aperture combining method, several 100s PW laser beam is expected to be obtained by using this MPC method in the future.

ID: 331
TOM 13 Ultrafast Optical Technologies and Applications

Temporal pulse quality in cascaded post-compression

Esmerando Escoto1, Anne-Lise Viotti1,2, Praveen Kumar Velpula1, Wim P. Leemans1, Ingmar Hartl1, Christoph M. Heyl1,3,4

1Deutsches Elektronen-Synchrotron DESY, Germany; 2Department of Physics, Lund University, P.O Box 118, SE-221 00 Lund, Sweden; 3Helmholtz-Institute Jena, Fröbelstieg 3, 07743 Jena, Germany; 4GSI Helmhotzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany

We present a solution to the degradation of temporal quality in self-phase-modulation (SPM)-based post-compression by cascading the broadening process into multiple stages. We numerically show how the degradation of the pulse's temporal quality at high compression ratio saturates if higher-order chirp compensation is employed. We further demonstrate the mitigation of temporal quality degradation via cascaded broadening even at very high compression ratios while increasing the peak power boost, providing a route towards pre/post-pulse -free post-compression.

ID: 337
TOM 13 Ultrafast Optical Technologies and Applications

Crossed-polarized scheme for background free hybrid fs/ps-CARS spectroscopy applied to diagnostics in multiphasic environment and hyperspectral microscopy

Michael Scherman, Elodie Lin, Brigitte Attal-Tretout

DPHY, ONERA, Université Paris Saclay, Palaiseau, France

We perform hybrid fs/ps-CARS spectroscopy applied to diagnostics in multiphasic environment and hyperspectral microscopy. A polarization-based method is introduced to reject intense background contribution originating from condensed matter signal. Two test cases have been investigated. In the first one, gas phase medium is probed close to thick glass windows and a 43 factor improvement in signal-to-background ratio is demonstrated. In the second one, 3-colors colinear CARS microscopy with degenerate probe is demonstrated thanks to this polarization arrangement.

ID: 345
TOM 13 Ultrafast Optical Technologies and Applications

A spectral resolution study in femtosecond stimulated Raman scattering microscopy

Rajeev Ranjan1,2, Maria Antonietta Ferrara2, Luigi Sirleto2

1Istituto Italiano Di Tecnologia Genova, Italy, Italy; 2Institute of Applied Sciences and Intelligent Systems Napoli, Italy

In biomedical applications, simultaneous mapping and specificity of different chemical species are desirable. Due to the linear dependence of SRS signals from concentration and the chemical selectivity offered by this technique, SRS can be a powerful method as a label free tool to map the distributions of individual species in a multi component system. In this framework, spectral resolution, i.e., the ability to distinguish closely lying resonances, cross correlation measurements of TiSa and OPO beams in SRS microscope and the separation of protein, lipid in the CH region are reported.

ID: 426
TOM 14 Advances and Applications of Optics and Photonics

Statistical analysis of photoluminescence decay kinetics in QD ensembles

César Rui Bernardo, Eduardo Pereira, João Ricardo Martins, Michael Belsley, Peter Schellenberg, Mikhail Igorevich Vasilevskiy

Minho University, Portugal

In this work we further try understanding and modelling the fluorescence lifetimes obtained via TCSPC.The main difficulties are that the QDs systems are heterogeneous and the overall fluorescence decay is influenced by several different decay mechanisms. In this work the fitting and statistical analysis of the decay curves using a variety of different models is discussed, commenting on how well they describe the obtained experimental TCSPC data from CdSe QDs in solution and embedded within a polymeric matrix.

ID: 380
TOM 13 Ultrafast Optical Technologies and Applications

Czochralski growth of mixed sesquioxide crystals for ultrafast lasers

Christian Kränkel, Anastasia Uvarova, Émile Haurat, Lena Hülshoff, Mario Brützam, Christo Guguschev, Sascha Kalusniak, Detlef Klimm

Leibniz-Institut für Kristallzüchtung, Germany

Cubic rare-earth sesquioxide crystals are strongly demanded host materials for high power lasers, but due to their high melting points their growth remains a challenge. Our thermal investigations in the ternary system Lu2O3-Sc2O3-Y2O3 reveal compositions with melting temperatures below 2200 °C suitable for the growth of high optical quality mixed sesquioxide crystals by the Czochralski method. We present our results on the growth and characterization of Er3+- and Yb3+-doped (Sc,Y)2O3 crystals.