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
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Please note that all times are shown in the time zone of the conference. The current conference time is: 29th June 2022, 09:23:58 CEST
Early Stage Researcher Session: Sensing and Spectroscopy
8:15 - 9:45
Session Chair: Ventsislav K, Valev, University of Bath, United Kingdom
8:15 - 8:30 ID: 205 Early Stage Reserch Session
In situ sub-50-attosecond active stabilization of the delay between infrared and ultraviolet light pulses
Martin Luttmann, David Bresteau, Jean-François Hergott, Olivier Tcherbakoff, Thierry Ruchon
Université Paris-Saclay, CEA, CNRS, LIDYL, 91191 Gif-sur-Yvette, France
The flourishing of attosecond science (1 as = 10e−18s) has created a need to control exquisitely the delay between two ultrashort light pulses, typically a near-infrared pulse, and an extreme-ultraviolet pulse. Here we introduce a robust technique, named LIZARD (Laser-dressed IoniZation for the Adjustment of the pump-pRobe Delay), allowing in situ active stabilization of this pump-probe delay. The method uses the two-photon photoelectron signal obtained by photoionizing a gas target with the two superimposed beams. The resulting delay stability (below 30 as) makes LIZARD a promising tool for attosecond pump-probe experiments.
8:30 - 8:45 ID: 162 Early Stage Reserch Session
Frequency tripling via sum-frequency generation by individual AlGaAs nanocylinders
Agostino Di Francescantonio1, Attilio Zilli1, Davide Rocco2, Marco Finazzi1, Lamberto Duò1, Costantino De Angelis2, Giuseppe Leo3, Carlo Gigli3, Giuseppe Marino3, Michele Celebrano1
1Politecnico di Milano, Italy; 2University of Brescia, Italy; 3Universitè de Paris, France
We report sum-frequency generation (SFG) by individual AlGaAs nanocylinders pumped by a beam at a telecom frequency ω and by its second harmonic 2ω. Using these frequencies, SFG is degenerate with third-harmonic generation (THG). We achieve efficient frequency tripling via a second-order nonlinearity and observe a SFG emission sensitive to the cylinder size and to the polarization of the pumps at ω and 2ω. Finally, taking advantage of the simultaneous detection of SFG and THG, we determine χ(3) = 7×10-20 m2/V2.
8:45 - 9:00 ID: 131 Early Stage Reserch Session
Few-electrons strong coupling between graphene plasmons and intersubband transitions in a shallow single quantum well
1Laboratorio NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, 56127, Pisa, Italy; 2Dipartimento di Fisica “E. Fermi”, Università di Pisa, Largo Bruno Pontecorvo 3, 56127 Pisa, Italy
We conceived and investigated by finite element simulations two possible structures to couple graphene plasmons with intersubband transitions in a shallow semiconductor single quantum well. We proved that, thanks to the strong confinement factor of light in graphene, a large Rabi splitting arises between the new polaritonic modes, showing features of strong and ultra-strong coupling. By exploiting recently demonstrated ultra-compression of light at the nanometre scale, we designed a system where strong coupling can be achieved even in the few-electrons regime.
9:00 - 9:15 ID: 308 Early Stage Reserch Session
Ultrafast exciton dynamics reconstruction with a ptychographic approach
Gian Luca Dolso1, Bruno Moio1,2, 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
Excitons characterize the ultrafast response of many materials of technological interest. While the development of attosecond science has unlocked the possibility of performing experiments with a suitable time- resolution, the access to the exciton properties remains a non-trivial step. We propose therefore a novel approach to disclose the physical properties behind the ultrafast exciton dynamics based on a phase-retrieval method.
9:15 - 9:30 ID: 452 Early Stage Reserch Session
Singlet fission in thin films for photovoltaics: A molecular perspective
Aswathy V Girija1, Weixuan Zeng2, Hugo Bronstein2, Akshay Rao1
1Cavendish Laboratory, Department of Physics, University of Cambridge, UK; 2Yusuf Hamied Department of Chemistry, University of Cambridge, UK
Singlet fission (SF) is a spin-allowed carrier multiplication process in organic systems offering 200% quantum efficiencies, surpassing the Shockley-Queisser limit in conventional photovoltaics. In this talk, I will introduce a new class of organic molecules called Pechmann dyes designed based on Baird's aromaticity rule, undergoing SF. I will discuss their photophysics in thin films and present the triplet formation evidenced from ultrafast transient absorption and electron spin resonance spectroscopy. This work elucidates the relationship between structure, aromaticity, and singlet-triplet energetics as a benchmark for designing novel and efficient SF systems.
9:30 - 9:45 ID: 189 Early Stage Reserch Session
Near-field optical investigation of hyperuniform disordered photonic structures
Nicoletta Granchi1, Richard Spalding2, Matteo Lodde3, Maurangelo Petruzzella3, Frank W. Otten3, Andrea Fiore3, Francesca Intonti1, Riccardo Sapienza4, Marian Florescu2, Massimo Gurioli1
1University of Florence, Italy and LENS; 2Advanced Technology Institute and Department of Physics, University of Surrey, UK; 3Department of Applied Physics and Institute for Photonic Integration, Eindhoven University of Technology, NL; 4The Blackett Laboratory, Department of Physics, Imperial College London, UK
Located in-between random structures and perfectly ordered photonic crystals, there is a special class of disordered heterostructures called hyperuniform disordered (HuD) photonic structures. These materials, due to the presence of a photonic bandgap, combine the advantages of disordered systems and ordered systems: here, we underline and experimentally prove all these advantages by means of the first near-field optical characterization of HuD photonic structures in the near IR.