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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 l.l.e 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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Spatiotemporally reconfigurable light in degenerate laser cavities

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Photonics Research 2023年第10期11卷 1751-1756页

作者： A.BARTOlO N.VIGNE M.MARCONI G.BEAUDOIN l.l. gratiet K.PANTZAS I.SAGNES A.GARNACHE M.GIUDICI UniversitéCôte d’Azur CNRSInstitut de Physique de Nice06200 NiceFrance Institut d’Electronique et des Systèmes CNRS UMR521434000 MontpellierFrance Centre de Nanosciences et de Nanotechnologies CNRS UMR 9001UniversitéParis-Saclay91120 PalaiseauFrance

We show that a Ⅲ-V semiconductor vertical external-cavity surface-emitting laser(VECSEl) can be engineered to generate light with a customizable spatiotemporal structure. Temporal control is achieved through the emission of temporal.l.calized structures(TlSs), a particular mode-locking regime that allows individual addressing of the pulses traveling back and forth in the cavity. The spatial profile control relies on a degenerate external cavity, and it is implemented due to an absorptive mask deposited onto the gain mirror that limits the positive net gain within two circular spots in the transverse section of the VECSEl. We show that each spot emits spatially uncorrelated TlSs. Hence, the spatiotemporal structure of the light emitted can be shaped by individually addressing the pulses emitted by each spot. Because the maximum number of pulses circulating in the cavity and the number of positive net-gain spots in the VECSEl can be increased straightforwardly, this result is a proof of concept of a laser platform capable of handling light states of scalable complexity. We discuss applications to three-dimensional alloptical buffers and to multiplexing of frequency combs that share the same laser cavity.

关键词： light cavity mirror

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