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Direct observation of photonic Landau levels and helical edge states in strained honeycomb lattices

Light(Science & Applications) 2020年第1期9卷 627-636页

作者： Omar Jamadi Elena Rozas Grazia Salerno Marijana Milicevic Tomoki Ozawa Isabelle Sagnes aristide lemaitre Luc Le Gratiet Abdelmounaim Harouri Iacopo Carusotto Jacqueline Bloch Alberto Amo Universite de Lille CNRSUMR 8523—PhLAM—Physique des Lasers Atomes et Molecules59000 LilleFrance Depto.de Fisica de Materiales e Instituto Nicolas Cabrera Universidad Autonoma de Madrid(UAM)28049 MadridSpain Center for Nonlinear Phenomena and Complex Systems Universite Libre de BruxellesCP 231Campus PlaineB-1050 BrusselsBelgium Universite Paris-Saclay CNRSCentre de Nanosciences et de Nanotechnologies91120 PalaiseauFrance Interdisciplinary Theoretical and Mathematical Sciences Program(iTHEMS) RIKENWakoSaitama 351-0198Japan INO-CNR BEC Center and Dipartimento di Fisica Universita di Trento38123 PovoItaly

We report the realization of a synthetic magnetic field for photons and polaritons in a honeycomb lattice of coupled semiconductor micropillars.A strong synthetic field is induced in both the s and p orbital bands by engineering a uniaxial hopping gradient in the lattice,giving rise to the formation of Landau levels at the Dirac *** provide direct evidence of the sublattice symmetry breaking of the lowest-order Landau level wavefunction,a distinctive feature of synthetic magnetic *** realization implements helical edge states in the gap between n=0 and n=±1 Landau levels,experimentally demonstrating a novel way of engineering propagating edge states in photonic *** light of recent advances in the enhancement of polariton–polariton nonlinearities,the Landau levels reported here are promising for the study of the interplay between pseudomagnetism and interactions in a photonic system.

关键词： Landau helical realization

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Giant ultrafast dichroism and birefringence with active nonlocal metasurfaces

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Light(Science & Applications) 2024年第10期13卷 2240-2250页

作者： Giulia Crotti Mert Akturk Andrea Schirato Vincent Vinel Anton A.Trifonov Ivan C.Buchvarov Dragomir N.Neshev Remo Proietti Zaccaria Paolo Laporta aristide Lemaître Giuseppe Leo Giulio Cerullo Margherita Maiuri Giuseppe Della Valle Department of Physics Politecnico di Milano20133 MilanoItaly Istituto Italiano di Tecnologia 16163 GenovaItaly Laboratoire Matériaux et Phénomènes Quantiques(MPQ) UniversitéParis Cité&CNRS75013 ParisFrance John Atanasoff Center for Bio and Nano Photonics(JAC BNP) 1164 SofiaBulgaria Department of Physics St.Kliment Ohridski University of Sofia5 James Bourchier Boulevard1164 SofiaBulgaria ARC Centre of Excellence for Transformative Meta-Optical Systems(TMOS) Research School of PhysicsAustralian National UniversityActonACT 2601Australia. Cixi Institute of Biomedical Engineering Ningbo Institute of Industrial TechnologyChinese Academy of SciencesNingbo 315201China. Istituto di Fotonica e Nanotecnologie(IFN) Consiglio Nazionale delle Ricerche20133 MilanoItaly. UniversitéParis-Saclay CNRSCentre de Nanosciences et de Nanotechnologies10 Boulevard Thomas Gobert91120 PalaiseauFrance Institut Universitaire de France(IUF) ParisFrance

Switching of light polarization on the sub-picosecond timescale is a crucial functionality for applications in a variety of contexts,including telecommunications,biology and *** ability to control polarization at ultrafast speed would pave the way for the development of unprecedented free-space optical links and of novel techniques for probing dynamical processes in complex systems,as chiral *** high switching speeds can only be reached with an all-optical paradigm,i.e.,engineering active platforms capable of controlling light polarization via ultrashort laser *** we demonstrate giant modulation of dichroism and birefringence in an all-dielectric metasurface,achieved at low fluences of the optical control *** performance,which leverages the many degrees of freedom offered by all-dielectric active metasurfaces,is obtained by combining a high-quality factor nonlocal resonance with the giant third-order optical nonlinearity dictated by photogenerated hot carriers at the semiconductor band edge.

关键词： dielectric surfaces nonlinearity

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