Tensorial phase control in nonlinear meta-optics Article - 2021

Carlo Gigli, Giuseppe Marino, Alberto Artioli, Davide Rocco, Costantino de Angelis, Julien Claudon, Jean-Michel Gérard, Giuseppe Leo

Carlo Gigli, Giuseppe Marino, Alberto Artioli, Davide Rocco, Costantino de Angelis, Julien Claudon, Jean-Michel Gérard, Giuseppe Leo, « Tensorial phase control in nonlinear meta-optics  », Optica, 2021, p. 269. ISSN 2334-2536

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 χ ( 2 ) fully tensorial features of AlGaAs metasurfaces, we propose a robust method to generate 0 − 2 π 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.

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