Nonlinear asymmetric imaging with AlGaAs metasurface

Author:

Rocco Davide1ORCID,Locatelli Andrea1ORCID,Carletti Luca1ORCID,Vincenti Maria Antonietta1ORCID,De Angelis Costantino1ORCID

Affiliation:

1. National Institute of Optics-National Research Council (INO-CNR)

Abstract

Nowadays, dielectric metasurfaces are a promising platform in many different research fields such as sensing, lasing, all-optical modulation and nonlinear optics. Among all the different kinds of such thin structures, asymmetric geometries are recently attracting increasing interest. In particular, nonlinear light-matter interaction in metasurfaces constitutes a valid approach for achieving miniaturized control over light. Here, we demonstrate nonlinear asymmetric generation of light in a dielectric metasurface via second harmonic generation. By inverting the illumination direction of the pump, the nonlinear emitted power is modulated by more than one order of magnitude. Moreover, we demonstrate how a properly designed metasurface can generate two completely different images at the second harmonic when the direction of illumination is reversed. Our results may pave the way to important opportunities for the realization of compact nanophotonic devices for imaging applications by densely integrating numerous nonlinear resonators.

Funder

Ministero dell'Università e della Ricerca

Publisher

Optica Publishing Group

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