Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 77: Poster: Plasmonics and Nanooptics
O 77.23: Poster
Wednesday, March 14, 2018, 18:15–20:30, Poster A
Imaging with ultrathin nonlinear metalenses — •Christian Schlickriede1, Philip Christian Georgi1, Guixin Li3, Shuang Zhang2, and Thomas Zentgraf1 — 1Universität Paderborn, Paderborn, Germany — 2School of Physics and Astronomy, University of Birmingham, United Kingdom — 3Department of Materials Science and Engineering, Southern University of Science and Technology, China
In our approach we fabricate a new kind of plasmonic metalens, which is solely working in the nonlinear regime by instantaneous frequency conversion for the incident near-infrared light. Therefore, we use the concept of a nonlinear geometric phase emerging from the configuration of meta-atoms with specific rotational symmetry. The designed nonlinear metalenses are ultrathin devices with a thickness of only 30 nm. Depending on the incident circular polarization of light, the phase profile for the nonlinear harmonic generation process can be switched between convex and concave. 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 traditional lens equation but by a modified version of it.