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
Thursday, 16/Sept/2021:
13:45 - 15:00

ID: 312
TOM 1 Silicon Photonics and Guided-Wave Optics

Bulk transition metal dichalcogenides as a promising integrated photonics platform

Andrey A Vyshnevyy

MIPT, Russian Federation

Following the discovery of graphene, a family of two-dimensional materials continues to attract huge scientific interest, with most of the focus being on optoelectronic applications of their single-atomic layers. It is less known, however, that bulk layers of transition metal dichalcogenides have a higher refractive index than silicon and exhibit giant optical anisotropy. We discuss how these properties allow one to design photonic integrated circuits with a higher density of integration thanks to weaker waveguide crosstalk and lower bending losses.

ID: 274
TOM 5 Resonant Nanophotonics

Modelling the optical Kerr effect in photonic nanostructures

Tomasz Filip Matthia

ONERA, France

We present a modal method for calculating the optical Kerr effect in layered photonic nanostructures. An example of optical Kerr effect exaltation is shown on a coupled nano-Fabry-Perot structure.

ID: 372
TOM 5 Resonant Nanophotonics

Tunable and polarization-insensitive metamaterial absorber in the visible spectrum

Issah Ibrahim1, Fangfang Li2, Marian Baah2, Isaac Appiah Otoo2, Lewis Asilevi2, Prince Bawuah3, Benjamin Asamoah2

1Tampere University, Finland; 2University of Eastern Finland, Finland; 3University of Cambridge,Cambridge

We demonstrate that, by varying the thickness of the dielectric spacer in a three-layermetamaterial absorber, we can tune the spectral absorbance across the whole visiblespectrum. This effect arises due to the excitation and enhancement of propagatingsurface plasmons, and localized surface plasmons. These results are beneficial forapplications including solar power generation and those that require selective absorp-tion.

ID: 279
TOM 5 Resonant Nanophotonics

Numerical analysis of plasmonic metasurfaces for fluorescence enhancement

Roxana Tomescu, Florin Nita, Stefan Caramizoiu, Veronica Anastasoaie, Dana Cristea

IMT-Bucharest, Romania

The paper presents an extensive numerical analysis performed by 3D-simulations using the FDTD method to identify the optimal configuration of the nano-antennas that constitute a plasmonic metasurface. The aim was to achieve the highest resonance for local enhancement of the excitation field and collection efficiency of emitted photons. We investigated different metals, shapes and geometrical parameters for the nano-resonators composing the metasurface. The best results for Rhodamine 6G excitation and emission were obtained using silver cylindrical resonators with 105 nm diameter in a rectangular array, and with 110 nm long U-shape.

ID: 520
TOM 5 Resonant Nanophotonics

Hybrid tunable plasmonic resonances based on ripple graphene on a periodic W-shape nanostructure

Tingting Zhai1, Shijian Wang1, Kuan-Ting Wu1,2,3, Remi Vincent1, Wei-Yen Woon2,3, Rafael Salas-Montiel1

1Laboratory Light, nanomaterials, and nanotechnologies – L2n CNRS ERL 7004, Université de Technologie de Troyes, 10004, Troyes, France; 2Condensed Matter Physics Laboratory, National Central University, 32001, Taoyuan City, Taiwan; 3Molecular Science and Technology, Academia Sinica and National Central University, 10617, Taipei City, Taiwan

Graphene plasmon polaritons(GPPs) have attracted great interest over the past decade owing to its electrical and optical properties, such as electrically tunable property, extreme confinement, ultrabroad tuning spectrum, and low intrinsic loss. However, these properties are degraded when graphene is placed on top a substrate such as silicon dioxide, limiting its potential applications. Here, we demonstrate a sub-wavelength periodic W-shaped structure that shapes graphene, leading to an enhancement of the GPPs optical properties.

ID: 323
TOM 7 Thermal radiation and energy management

Control of thermal emission via refractory multilayers

Daniela De Luca1,2, Carmine D'Alessandro2,3, Davide De Maio2,3, Marilena Musto2,3, Emiliano Di Gennaro1,2, Roberto Russo2

1Department of Physics, University of Naples "Federico II"; 2CNR-ISASI, Napoli, Italy; 3Department of Industrial Engineering, University of Naples "Federico II"

The control of thermal radiation is a crucial factor in reaching higher efficiency in various energy applications. Here, we present a metamaterial with a sharp transition from a high emissivity to a very low emissivity. The metamaterial has an easy-to-fabricate and customizable multilayer structure, which allows to maximize the thermal emission in the region of the desired wavelengths. The structure is being developed for Thermo-Photovoltaic (TPV) and energy storage applications, therefore the materials involved in the design must be thermally stable. The designed multilayer shows very promising results.

ID: 306
TOM 7 Thermal radiation and energy management

Low emissivity coatings to enhance medium temperature efficiency of evacuated solar collectors.

Davide De Maio1,2, Antonio Caldarelli1,2, Carmine D'Alessandro1,2, Eliana Gaudino1,2, Marilena Musto1, Daniela De Luca2,3, Emiliano Di Gennaro3, Roberto Russo2

1University of Napoli “Federico II”, 80126 Napoli, Italy; 2National Research Council of Italy, Napoli Unit, Institute of Applied Sciences and Intelligent Systems, 80131 Napoli, Italy; 3Physics Department, University of Napoli “Federico II”, 80126 Napoli, Italy

In evacuated flat plate solar collectors, thanks to the high vacuum insulation, the main loss mechanism is only represented by radiative losses from the selective absorber. Radiative losses incidence on the performances of the collector increases with increasing temperature. Low emissivity thin film coatings on an Aluminium bulk substrate could improve the coating performances by reducing its thermal emittance, keeping the economic advantages of using a substrate as cheap and light as Aluminium.

ID: 434
TOM 8 Non-linear and Quantum Optics

Four Wave Mixing to measure the pulse duration of photonic crystal nanolasers

Federico Monti1, Alejandro Yacomotti1, Fabrice Raineri1,2

1Centre de Nanosciences et de Nanotechnologies, CNRS, Université de Paris Saclay, Palaiseau, France; 2Université de Paris, 5 Rue Thomas Mann, 75013, France

We propose an optical gating experiment to study the dynamics of nanolasers taking advantage of nonlinear interactions (FWM) in a dispersion-shifted fiber (DSF). This constitutes a new methodology to study an extremely fast (10 ps – 20 ps) and weak response (~ µW peak power) of nanolasers emission when

pumped by a very short light pulse on the order of ~ 250 fs. In this work, we aim to study the temporal properties of 1.55μm InGaAs/InP 1D photonic crystal lasers operating at room temperature.

ID: 339
TOM 8 Non-linear and Quantum Optics

Optical parametric oscillations in periodically poled LiTaO3 via quadratic cascading and electro-optic effects

Safia Mohand ousaid1, Kai.-H Chang1,2, Mahmoud Chakaroun1, Lung.-H Peng2, Azzedine Boudrioua1

1Université Sorbonne Paris Nord, France; 2National Taiwan University, Taiwan

In this paper, we report the investigation of optical parametric oscillations using nonlinear photonic crystals of periodically poled LiTaO3 (PPLT). We point-out the generation of two pairs of signal and idler (OPO1 and OPO2) in the same nonlinear photonic crystal. It is found that the second pair OPO2 appears with different quasi-phase matching conditions induced by a local refractive index variation. Our analysis indicates that this index variation results from a competing effect between quadratic cascading and electro-optic induced refractive index changes

ID: 219
TOM 8 Non-linear and Quantum Optics

Fermi-Pasta-Ulam-Tsingou recurrence for 2-D vortex eigenstates

Angel Paredes, Jose Salgueiro, David Olivieri, Humberto Michinel

Universidade de Vigo, Spain

We study a certain class of eigenstates of the two-dimensional nonlinear Schrödinger equation with focusing Poisson and cubic nonlinearities. The states take the form of self-trapped vortex rings endowed with azimuthal phase. For each value of the topological charge l, there is a parameter-dependent family of solutions that are linked to the relative importance of the cubic term. Remarkably, certain vortex rings break down due to linear instabilities but the nonlinear evolutions leads to the reconstruction of the initial profile resembling the well-known Fermi-Pasta-Ulam-Tsingou-like recurrence.

ID: 264
TOM 8 Non-linear and Quantum Optics

Spontaneous four-wave-mixing enhancement via dark-state engineering

Hui-Min Zhao3, XiaoJun Zhang3, Maurizio Artoni1,4, Giuseppe La Rocca2, Jin Hui Wu3

1Department of Engineering and Information Technology, University of Brescia, Italy; 2Scuola Normale Superiore, Pisa, Italy; 3Center for Quantum Sciences, Northeast Normal University, Changchun, China; 4European Laboratory for Non-Linear Spectroscopy, Sesto Fiorentino, Italy

Multiple four-wave-mixings can be used to improve the efficiency of a spontaneously generated Stokes and antiStokes photon pair via a symmetric level configuration that exhibits dark-state trapping. Preliminary results in atomic interfaces show that photon pair generation can be achieved while being absorption and hampering gain effects largely suppressed. Extensions to solid interfaces are also envisaged.

ID: 343
TOM 8 Non-linear and Quantum Optics

Stimulated Raman microscopy implemented by three femtosecond laser sources

Rajeev Ranjan1,2, Maria Antonietta Ferrara2, Luigi Sirleto2

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

Design and the implementation of a femtosecond Stimulated Raman Scattering microscope, equipped with three femtosecond laser sources. A Titanium-Sapphire, an optical parametric oscillator, and a second harmonic generator is presented. Our microscope is designed in such a manner that it can cover all the regions of Raman spectra, taking advantage of two possible laser combinations. The first, TiSa and OPO laser beams, which cover the CH region or O-H region in stimulated Raman gain modality, whereas the second, TiSa and SHG laser beams, covers the CH region and the fingerprint region.

ID: 344
TOM 10 Optical Microsystems (OMS)

Auto-correlation measurements of femtosecond laser beams in srs microscope

Rajeev Ranjan1,2, Maria Antonietta Ferrara2, Luigi Sirleto2

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

Autocorrelation is important because they allow monitoring the pulse duration and chirp of the laser beam, which are a fundamental parameter to optimize the nonlinear light matter interaction in microscopy. In this paper, we investigate the two laser sources. In our case, a femtosecond Ti:Sapphire oscillator and a femtosecond synchronized optical parametric oscillator is characterized by non-linear interferometric measurements. Taking advantage of two-photon absorption, autocorrelation measurements of each laser beam are carried out. Results are reported and discussed.

ID: 237
TOM 10 Optical Microsystems (OMS)

Multiplexed fiber-optic Fabry-Pérot cavities for refractive index and temperature sensing fabricated using diamond-blade dicing

Ivonne Pfalzgraf, Sergiy Suntsov, Kore Hasse, Detlef Kip

Helmut Schmidt University, Germany

We report on multiplexing several Fabry-Perot (FP) cavities in single-mode optical fibers for high-precision spatially resolved sensing of refractive indices (RI) of liquids. Resonators are fabricated by cutting small slots into fibers using a diamond-blade dicing saw and additionally coated with thin Ta2O5 layers to increase cavity reflectance. The multiplexing performance, temperature compensation ability and accuracy of the fabricated sensors with up to four open cavities were tested on sucrose solutions over a range of temperatures.

ID: 531
TOM 10 Optical Microsystems (OMS)

Optimized solar absorber coatings for solar collectors under high vacuum

Antonio Caldarelli1,2, Davide De Maio1,2, Carmine D'Alessandro1,2, Eliana Gaudino1,2, Marilena Musto1, Daniela De Luca2,3, Emiliano Di Gennaro3, Roberto Russo2

1Industrial Engineering Department, University of Napoli “Federico II”, 80126 Napoli, Italy; 2National Research Council of Italy, Napoli Unit, Institute of Applied Sciences and Intelligent Systems, 80131 Napoli, Italy; 3Physics Department, University of Napoli “Federico II”, 80126 Napoli, Italy

A CPC system embedded in a high vacuum thick envelope and an evacuated flat plate solar collector are compared. Multilayer absorber coatings based on a Cr2O3/Cr/Cr2O3 tri-layer structure have been optimized to work at 573 K for both solutions, maximizing the efficiency.

ID: 328
TOM 10 Optical Microsystems (OMS)

Simulation of the optical properties of gold nanoparticles on sodium alginate

Caterina Summonte1, Piera Maccagnani1, Alberto Maurizi1,2, Giulio Pizzochero1, Gabriele Bolognini1

1CNR, Italy; 2Dipartimento di Scienze Statistiche “Paolo Fortunati” Università di Bologna, Italy

We report on the simulation of reflectance and transmittance spectra taken on a set of non-continuous gold nanoparticles thin film deposited on sodium alginate.

The spectra are simulated by means of the Generalized Transfer Matrix method, using the Lorentz oscillator model, by taking into account that the optical function of nanostructured gold exhibits reduced relaxation time. The localized surface plasmon is simulated through a dedicated oscillator.

The experimental results are well reproduced by the applied model. We show that an in-plane coalescence occurs for film thicknesses larger than 5 nm.

ID: 363
TOM 13 Ultrafast Optical Technologies and Applications

Blue diode pumped Ti:sapphire fs oscillators for multiphoton imaging and OCT, and blue diode pumped room temperature amplifiers

Bojan Resan1,2, Daniel Hug1, Romain Carreto1, Omar E. Olarte3, Pablo Loza-Alvarez3, Ivan Kuznetsov4

1School of Engineering, University of Applied Sciences and Arts Northwestern Switzerland, 5210 Windisch, Switzerland; 2Faculty of Medicine, Josip Juraj Strossmayer University, 31000 Osijek, Croatia; 3The Institute of Photonic Sciences, 08860 Castelldefels (Barcelona), Spain; 4The Institute of Applied Physics of the Russian Academy of Science, 603950 Nizhny Novgorod, Russia

We report our achievements with blue diode pumped Ti:sapphire fs oscillators and amplifiers. SESAM modelocked oscillator generated 460 mW output power and 65 fs pulses at 90 MHz and was used for multiphoton microscopy. Kerr-lens modelocked oscillator features broadbandwidth of 71 nm with output power of 300 mW, suitable for OCT. Our simulations predict that up to 20% small signal gain should be feasible for amplifier with 40 W pumping. Preliminary measured 4% single-pass gain with 10 W pumping is promising for room temperature Ti:sapphire amplifier.

ID: 366
TOM 13 Ultrafast Optical Technologies and Applications

Simultaneous multifocus CARS spectroscopy for gases and microscopy

Elodie Lin, Michael Scherman, Brigitte Attal-Tretout

DPHY, ONERA, Université Paris Saclay, Palaiseau, France

We perform multifocus hybrid fs/ps-CARS spectroscopy applied to gas phase diagnostics and hyperspectral microscopy. The scheme is first used to record single shot N2 CARS spectra from two spots that are 3 mm apart in ambient air and perform simultaneous 1 kHz temperature follow-up in the vicinity of a flame. Then 2-point-CARS simultaneous spectroscopy is performed within a microscope in liquid toluene with 38 µm separation between the two laser spots. It demonstrates how to increase the amount of spatial information retrieved by CARS spectroscopy at minimum laser energy cost.

ID: 378
TOM 13 Ultrafast Optical Technologies and Applications

Interaction of Tungsten tips with Laguerre-Gaussian beams

Abhisek Sinha1, Debobrata Rajak2, Shilpa Rani1, Ram Gopal2, Vandana Sharma1

1Indian Institute of Technology Hyderabad, India; 2Tata Institute of Fundamental Research Hyderabad, India

Interaction of femtosecond laser pulses with metallic tips have been studied extensively and they have proved to be a very good source of ultrashort electron pulses. We present our study of interaction of Laguerre-Gaussian (LG) laser modes with Tungsten tips. We report a change in the order of the interaction for LG beams and the difference in the order of interaction is attributed to ponderomotive shifts in the energy levels corresponding to the enhanced near field intensity supported by numerical simulations.

ID: 382
TOM 13 Ultrafast Optical Technologies and Applications

Improving the CEP stability of high-power few-cycle ytterbium-doped fiber lasers to a sub-300 mrad level

Evgeny Shestaev1,2, Steffen Hädrich1, Maxim Tschernajew1, Nico Walther1, Tino Eidam1, Arno Klenke2,3, Imre Seres4, Zoltán Várallyay4, Péter Jójárt4, Ádám Börzsönyi4, Jens Limpert1,2,3,5

1Active Fiber Systems GmbH, Germany; 2Friedrich-Schiller-University Jena, Germany; 3Helmholtz-Institute Jena, Germany; 4ELI-ALPS, ELI-HU Non-Profit Ltd., Hungary; 5Fraunhofer Institute for Applied Optics and Precision Engineering IOF, Germany

We discuss the relevance of the amplified spontaneous emission (ASE) as well as the pulse picking process for carrier-envelope phase (CEP) stability of high-power ytterbium-doped fiber few-cycle laser systems. The front-end of the laser system that generates 5.8 fs pulses with an energy of 1.1 mJ at a repetition rate of 100 kHz is optimized to significantly reduce the level of white phase noise and achieve an improvement of the integrated CEP noise from 620 to 260 mrad for Fourier frequencies ranging from 2 kHz to 50 kHz.

ID: 411
TOM 13 Ultrafast Optical Technologies and Applications

Octave-spanning supercontinuum generation in a Lead-Bismuth-Gallate based graded-index multimode fiber

Zahra Eslami1, Adam Filipkowski2,3, Dariusz Pysz2, Mariusz Klimczak3, Ryszard Buczynski2,3, Goery Genty1

1Tampere university, Finland; 2Institute of Microelectronics and Photonics, Poland; 3University of Warsaw, Poland

We report the generation of an octave spanning supercontinuum (SC) from 800~nm to 2800~nm in 20 cm multimode graded-index fiber made of lead-bismuth-gallate glasses. We study the SC generation as a function of pump wavelength both in normal and anomalous dispersion regime of the fiber. For specific light injection conditions, we further observe signatures of beam self-cleaning dynamics into the low-order LP01 and LP11 modes. This is the first demonstration of SC generation in a non-silica multimode gradient-index fiber, opening novel perspectives for producing broadband, high-power SC in the mid-infrared.

ID: 432
TOM 13 Ultrafast Optical Technologies and Applications

OPO/DFG system tuneable over 3.9 octaves (1.3 to 19 µm) employing spectral focusing to achieve bandwidths from 10 to 300 cm−1

Stefan Popien, Sebastian Kickhöfel, Gero Stibenz, Edlef Büttner, Ingo Rimke

APE GmbH, Germany

We report on a versatile source for NIR and MIR applications employing an OPO/DFG system to downconvert 1 µm radiation to 1.3 .. 19 µm (7700 .. 527 cm−1). Broadband emission is achieved over the whole tuning range while spectral focusing allows to significantly reduce bandwidths below 2200 cm−1 if required.

ID: 437
TOM 13 Ultrafast Optical Technologies and Applications

A universal angular-dispersion synthesizer that produces arbitrary dispersion profiles

Murat Yessenov, Layton Hall, Ayman Abouraddy

University of Central Florida, United States of America

We present a novel optical arrangement that introduces arbitrary angular dispersion profiles into optical pulses, and is thus capable of independently tuning the magnitude and sign of all dispersion orders. Using this universal angular-dispersion synthesizer we isolate individual dispersion orders and modify their magnitude and sign up to fourth order. Moreover, we produce controlled superpositions of multiple dispersion orders, thereby producing dispersion profiles observed in optics for the first time. This breakthrough may be useful for new forms of phase and group-velocity matching in nonlinear optical interactions.

ID: 439
TOM 13 Ultrafast Optical Technologies and Applications

Optical frequency comb cavity ring down spectroscopy for near infrared sensing

Romain Dubroeucq, Robert Georges, Lucile Rutkowski

Univ Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France

We show the preliminary results of cavity ring-down spectroscopy based on a near-infrared frequency comb source and retrieve the multiplexed decays using a time-resolved fast-scanning Fourier transform spectrometer. We use a cavity with a moderate finesse to detect the absorption spectrum of the laboratory air.

ID: 451
TOM 13 Ultrafast Optical Technologies and Applications

Ultrafast time-of-flight imaging for accurate determination of stray light origin

Lionel Clermont1, Wilfried Uhring2, Marc Pierre Georges1

1Centre Spatial de Liege, STAR Research Unit, Liège Université, Belgium; 2University of Strasbourg, ICube Research Institute, France

We demonstrate a new approach for stray light characterization of optical instruments, based on ultrafast time-of-flight imaging. A pulsed laser source and a streak camera is used to record and identify individual stray light contributors, taking advantage of the fact that each stray light path has its own optical path length and therefore arrives at the focal plane at a specific time. This method will allow to better understand the origin of stray light, thus rendering more straightforward improvement of the instrument by re-design or processing.

ID: 461
TOM 13 Ultrafast Optical Technologies and Applications

Laser starting dynamic of Yb:fiber NALM oscillator

Yi Hua, Yuxuan Ma, Ingmar Hartl

DESY, Germany

We report numerical simulation results investigating laser starting dynamics of a compact all-PM fiber oscillator based on a nonlinear amplifying loop mirror (NALM). Depending on the initial starting conditions of the oscillator, the final steady state is reached through different paths via a competition between CW lasing and pulsing. The simulation shows that establishing stable CW lasing before pulse build-up in the oscillator cavity can prevent strong peak-power transients during startup. The transition from CW lasing to stable pulsing can be is achieved smoothly from noise by increasing the pump power.

ID: 467
TOM 13 Ultrafast Optical Technologies and Applications

Ultrashort-pulse, terawatt, long-wave infrared lasers based on high-pressure CO2 amplifiers

Mikhail Polyanskiy, Igor Pogorelsky, Marcus Babzien, Rotem Kupfer, Mark Palmer

Brookhaven National Laboratoty, United States of America

We discuss the state of the art, the ongoing research and development, and the potential for achieving a supra-terawatt peak power in few-cycle pulses at a long-wave infrared wavelength with a laser system based on high-pressure, mixed-isotope CO2 amplifiers.