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O: Fachverband Oberflächenphysik

O 76: Plasmonics and Nanooptics V: Tunable Structures and Nanoparticles (joint session O/CPP)

O 76.4: Vortrag

Mittwoch, 18. März 2020, 16:15–16:30, WIL A317

Silicon Metasurfaces for Nonlinear Holography and Wavefront Control — •Bernhard Reineke¹, Basudeb Sain¹, Ruizhe Zhao², Luca Carletti³, Bingyi Liu⁴, Lingling Huang², Costantino De Angelis⁵, and Thomas Zentgraf¹ — ¹Department of Physics, Paderborn University, Warburger Straße 100, D-33098 Paderborn, Germany — ²School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China — ³Department of Information Engineering, University of Padova, 35131 Padova, Italy — ⁴Institute of Modern Optics, Department of Physics, Harbin Institute of Technology, Harbin 150001, China — ⁵Department of Information Engineering, University of Brescia, 25123 Brescia, ItalyNational Institute of Optics (INO), CNR, 25123 Brescia, Italy

Metasurfaces based on dielectric nanostructures are an ideal platform for nonlinear optical experiments (such as third-harmonic generation). They provide high damage thresholds and strong nonlinear responses; Therefore, many works show progress dielectric metasurfaces with high nonlinear conversion efficiency. However, in achieving nonlinear wavefront control, less progress has been made. Therefore, we show the nonlinear wavefront control for the third-harmonic generation with a silicon metasurface. We choose a geometric phase approach to encode phase gradients and holographic images on a dielectric metasurface. In our experiment, we demonstrate the wavefront control and the multiplexed reconstruction of holograms at the third-harmonic wavelength. Our approach provides a simple principle for designing metasurfaces for nonlinear optical applications with dielectric building blocks.