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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16:00 - 16:45 Special Invited ID: 184 / TOM5 S04: 1 TOM 5 Resonant Nanophotonics
Tunable photon management in harmonic generation at the nanoscale
Costantino De Angelis
University of Brescia, Italy
Optical frequency conversion processes based on second and/or third order nonlinearities have been recently demonstrated with high efficiencies in open resonators made by semiconductors with high permittivity and negligible absorption.
I will present here recent achievements and perspectives to engineer efficiency, and directivity in these platforms; I will also discuss all optical control of photon generation in isolated nanoantennas and metasurfaces.
Dark-Field and Near-Field investigation of Si Mie resonators obtained via solid state dewetting
Michele Montanari1, Nicoletta Granchi1, Andrea Ristori1,2, Luca Fagiani3,4, Chiara Barri3,4, Mohammed Bouabdellaoui5, Marco Abbarchi5, Monica Bollani4, Massimo Gurioli1,2, Francesca Intonti1,2
1Dipartimento di Fisica e Astronomia, Università degli Studi di Firenze, 50019, Sesto Fiorentino, Italy; 2LENS, 50019, Sesto Fiorentino, Italy; 3Dipartimento di Fisica, Politecnico di Milano, 20133, Milano, Italy; 4L-NESS, IFN-CNR, 22100, Como, Italy; 5Aix Marseille Univ, Université de Toulon, CNRS, IM2NP 13397, Marseille, France
High-refractive-index dielectric Mie resonators have attracted much attention in the last years to manipulate light-matter interaction at the nanoscale due to their sharp Mie resonances at visible and near-infrared frequencies. However, the coupling with the substrate can strongly inﬂuence the resonant behavior of
the particles and it can be exploited to tune the optical features of the system. By exploiting solid state dewetting of pre-patterned ultra-thin silicon on insulator ﬁlms, we investigate, combining ﬁnite-diﬀerence time-domain simulations, Dark-Field spectroscopy and Near-Field scanning optical microscopy, the optical properties of the Si resonators.
Hybrid confinement of visible light in a nanophotonic resonator
Tommaso Perani1, Marco Liscidini1,2
1University of Pavia, Italy; 2Istituto di Fotonica e Nanotecnologie (CNR-IFN), Milano, Italy
We report on the design of a novel nanoresonator operating at visible wavelengths, in which light confinement is achieved by a hybrid mechanism based on total internal reflection and photonic band gap. We show that this structure can support resonant nanophotonic modes with mode volumes on the order of one cubic wavelength, and Q factors exceeding several tens of thousands. Its properties make it ideal for controlling and enhancing the light-matter interaction at sub-wavelength scales.
Second-harmonic generation of visible light by a monolithic lithium niobate metasurface
Attilio Zilli1, Luca Carletti2, Fabio Moia3, Andrea Toma3, Marco Finazzi1, Costantino De Angelis2, Dragomir N. Neshev4, Michele Celebrano1
1Politecnico di Milano, Department of Physics – Milano, Italy; 2University of Brescia, Department of Information Engineering and INO-CNR – Brescia, Italy; 3Istituto Italiano di Tecnologia – Genova, Italy; 4Australian National University, ARC Centre of Excellence TMOS – Canberra, ACT, Australia
We designed and realized a monolithic lithium niobate metasurface capable of efficient (2.4×10^(−8) conversion efficiency at 500 MW/cm^2 pump intensity) and highly directional second-harmonic generation of visible light in a transmission geometry. The operation in this key spectral range was enabled by tackling fabrication challenges which limit the achievable aspect ratio of lithographic nanostructures. Our result highlights the potential of a well-established photonics material platform such as lithium niobate for nonlinear optics at the nanoscale.