Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 33: Poster Session - Plasmonics and Nanooptics: Applications and other Aspects
O 33.5: Poster
Monday, March 16, 2020, 18:15–20:00, P1C
THG imaging with nonlinear dielectric metalenses — •Christian Schlickriede1, Sergey Kruk2, Basudeb Sain1, Yuri Kivshar2, and Thomas Zentgraf1 — 1Universität Paderborn, Paderborn, Deutschland — 2Australian National University, Canberra, Australien
In our approach we fabricate a new kind of nonlinear all-dielectric metalenses of sub-micrometre thickness, which are working in the nonlinear regime by third-harmonic frequency conversion for the incident near-infrared light. Therefore, we use wavefront control via the nonlinear Huygens principle emerging from the different nanopillar geometries. In the experiments, we determine the formation of the real and virtual focal planes for illumination with Gaussian beams and we demonstrate nonlinear imaging abilities that giving rise to real and virtual images of real objects at visible wavelengths. Most importantly, we found that the nonlinear image evolution is not governed by the conventional lens equation but by a modified version of it.