Scientific Results

Silicon Metasurfaces for Third Harmonic Geometric Phase Manipulation and Multiplexed Holography

Year: 2019

Authors: Reineke B., Sain B., Zhao RZ., Carletti L., Liu BY., Huang LL., De Angelis C., Zentgraf T.

Autors Affiliation: Paderborn Univ, Dept Phys, Warburger Str 100, D-33098 Paderborn, Germany; Beijing Inst Technol, Sch Opt & Photon, Beijing 100081, Peoples R China; Univ Padua, Dept Informat Engn, I-35131 Padua, Italy; Harbin Inst Technol, Dept Phys, Inst Modern Opt, Harbin 150001, Heilongjiang, Peoples R China; Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy; CNR, Natl Inst Opt INO, I-25123 Brescia, Italy

Abstract: Nonlinear wavefront control is a crucial requirement in realizing nonlinear optical applications with metasurfaces. Numerous aspects of nonlinear frequency conversion and wavefront control have been demonstrated for plasmonic metasurfaces. However, several disadvantages limit their applicability in nonlinear nanophotonics, including high dissipative loss and low optical damage threshold. In contrast, it has been shown that metasurfaces made of high-index dielectrics can provide strong nonlinear responses. Regardless of the recent progress in nonlinear optical processes using all-dielectric nanostructures and metasurfaces, much less advancement has been made in realizing a full wavefront control directly with the generation process. Here, we demonstrate the nonlinear wavefront control for the third-harmonic generation with a silicon metasurface. We use a Pancharatnam-Berry phase approach to encode phase gradients and holographic images on nanostructured silicon metasurfaces. We experimentally demonstrate the polarization-dependent wavefront control and the reconstruction of an encoded hologram at the third-harmonic wavelength with high fidelity. Further, we show that holographic multiplexing is possible by utilizing the polarization states of the third harmonic generation. Our approach eases design and fabrication processes and paves the way to an easy to use toolbox for nonlinear optical wavefront control with all-dielectric metasurfaces.

Journal/Review: NANO LETTERS (PRINT)

Volume: 19 (9)      Pages from: 6585  to: 6591

KeyWords: Silicon; metasurface; nonlinear; phase manipulation; holography; dielectric
DOI: 10.1021/acs.nanolett.9b02844

Citations: 5
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