3:30pm - 4:00pmInvitedID: 542
/ TOM6 S03: 1
TOM 6 Nonlinear and Quantum Optics
Nanooptics in anisotropic flatlands
Pablo Alonso Gozalez
University of Oviedo, Spain
Highly anisotropic crystals have recently attracted considerable attention due to their ability to support polaritons with unique properties, such as hyperbolic dispersion, negative phase velocity, or extreme confinement. In particular, the biaxial van der Waals semiconductor α-phase molybdenum trioxide (α-MoO3) has received much attention [1] due to its ability to support in-plane hyperbolic phonon polaritons (PhPs) —infrared (IR) light coupled to lattice vibrations in polar materials— with ultra-low losses, offering an unprecedented platform for controlling the flow of energy at the nanoscale.
In this talk, we will show experimental demonstrations of the unique behavior of PhPs in these crystals, including the visualization of anomalous cases of the fundamental optical phenomena of refraction [2] and reflection [3], and the exotic phenomenon of canalization, in which PhPs propagate along a single direction with ultralow losses [4].
4:00pm - 4:15pmID: 235
/ TOM6 S03: 2
TOM 6 Nonlinear and Quantum Optics
All optical controllable waveguiding structures induced by diffracting Bessel beams in a nonlinear medium
Yue Chai1,2, Nicolas Marsal1,2, Delphine Wolfersberger1,2
1Université de Lorraine, CentraleSupélec, LMOPS, F-57000, Metz, France; 2Chair in Photonics, CentraleSupélec, LMOPS, F-57070, Metz, France
In this work, we experimentally demonstrate the photo-inscription of complex waveguiding structures by a single diffracting Bessel beam (BB) propagating in a biased SBN crystal. Our optical platform enables all-optical control of the characteristics of such induced configurations by tailoring the parameters such as beam size, the electric field, and the input beam intensity. Our numerical results are in good agreement with our experimental work. In addition, we numerically study the interaction of two counterpropagating (CP) BBs under nonlinear conditions and the spatiotemporal dynamics of these photo-induced configurations. These results suggest more opportunities for fully controllable complex waveguiding structures and new all-optical solutions for active components in optical communication.
4:15pm - 4:30pmID: 165
/ TOM6 S03: 3
TOM 6 Nonlinear and Quantum Optics
Spin-orbit interaction through Brillouin scattering in nanofibers
Maxime Zerbib1, Maxime Romanet1, Thibaut Sylvestre1, Christian Wolff2, Birgit Stiller3,4, Jean-Charles Beugnot1, Kien Phan Huy1,5
1Institut Femto-ST, France; 2Center for Nano Optics, University of Southern Denmark, Denmark; 3Max Planck Institute for the Science of Light, Germany; 4Department of Physics, University of Erlangen-Nuremberg, Germany; 5SUPMICROTECH-ENSMM, France
Spin-orbit interactions (SOI), describing the transfer of a spin degree of freedom to an orbital angular momentum (OAM), have been widely explored in recent opto-acoustic studies for applications mainly in spintronics and for topological insulators. We report the observation of SOI by Brillouin scattering in an optical nanofiber. Specifically, we describe the transfer of a spin degree of freedom from light incident to the nanofiber to an acoustic vortex with a topological charge of order 2 in the form of OAM. Coupled with the phase matching condition for the energy conservation during Brillouin scattering, it results in a backscattered wave with a spin opposite to the incident wave. This observation allows considering applications of opto-acoustic Brillouin memory based on polarization conversion through a SOI.
4:30pm - 4:45pmID: 447
/ TOM6 S03: 4
TOM 6 Nonlinear and Quantum Optics
Improving photon pair generation in silica nanofibers through PMMA/DR1 nonlinear coating optimization
Abderrahim Azzoune1, Laurent Divay2, Christian Larat2, Sylvie Lebrun3
1Ecole Militaire Polytechnique, Laboratoire Systèmes Lasers, BP17, 16111, Bordj-El-Bahri, Algiers, Algeria; 2Thales Research and Technology, 91767, Palaiseau Cedex, France; 3Université Paris-Saclay, Institut d’Optique Graduate School, CNRS, Laboratoire Charles Fabry, 91127, Palaiseau, France
We report on the use of PMMA/DR1 coating to enhance the efficiency of photon pair generation in silica nanofibers. The coating improves the second-order nonlinear susceptibility of the nanofibers, leading to improved photon pair generation efficiency. We investigate the effect of varying the nonlinear optical properties of the composite material, and we characterize the photon pair generation efficiency of the coated silica nanofibers. Our modelling results show a significant enhancement in photon pair generation efficiency by a factor of 1000 compared to a bare silica nanofiber.
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