Tensorial phase control in nonlinear meta-optics

Year: 2021

Authors: Gigli C.; Marino G.; Artioli A.; Rocco D.; de Angelis C.; Claudon J.; Gerard J.-M.; Leo G.

Autors Affiliation: 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

Journal/Review: OPTICA

Volume: 8 (2)      Pages from: 269  to: 276

More Information: Agence Nationale de la Recherche (ANR-18CE24-0026).
KeyWords: enhanced 2nd-harmonic generation; polarization; metasurfaces; resolution
DOI: 10.1364/OPTICA.413329

Citations: 29
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