Tensorial phase control in nonlinear meta-optics
Autori: Gigli C.; Marino G.; Artioli A.; Rocco D.; de Angelis C.; Claudon J.; Gerard J.-M.; Leo G.
Affiliazione autori: Matyriaux et Phynomines Quantiques, University de Paris, Paris, France; Univ. Grenoble Alpes, CEA, IRIG-PHELIQS, Grenoble, France; Department of Information Engineering, University of Brescia, Brescia, Italy; INO-CNR, Via Branze 38, Brescia, 25123, Italy
Abstract: Nonlinear metasurfaces have recently brought harmonic generation to subwavelength level, with spectral and polarization control unachievable in bulk crystals. Not only does nonlinear meta-optics enable the investigation of nonlinear physics at the nanoscale, but it also opens promising technological perspectives. To date, however, no full-phase control has been demonstrated on a harmonic field generated with a sufficient efficiency for most practical purposes. In this work, based on the chi((2)) fully tensorial features of AlGaAs metasurfaces, we propose a robust method to generate 0 – 2 pi phase-encoded second harmonic light for nonlinear wavefront shaping, experimentally demonstrating nonlinear beam steering and all-dielectric metalenses that generate and focus second harmonic beams to sub-wavelength spot sizes. Nonlinear generation with record efficiency and phase control are achieved in nanostructured arrays that are fully compatible with mature III-V semiconductor technology. This breakthrough paves the way for the development of ultrathin, free-space photonic devices for nonlinear imaging, including night vision. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Volume: 8 (2) Da Pagina: 269 A: 276
Maggiori informazioni: Agence Nationale de la Recherche (ANR-18CE24-0026).Parole chiavi: enhanced 2nd-harmonic generation; polarization; metasurfaces; resolutionDOI: 10.1364/OPTICA.413329Citazioni: 20dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2023-12-10Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui