SKM 2023 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 14: Polar Oxide Crystals and Solid Solutions II
KFM 14.4: Vortrag
Donnerstag, 30. März 2023, 15:00–15:20, POT 106
Thin Patterned Lithium Niobate Metasurfaces by Parallel Additive Capillary Stamping of Aqueous Precursor Solutions — •Jan Klenen1, Fatih Alarslan2, Laura Vittadello1, Martin Steinhart2, and Mirco Imlau1 — 1Department of Physics, Osnabrück University, Germany — 2Institute of Chemistry of New Materials, Osnabrück University, Germany
Optical metasurfaces are a rapidly evolving field in the aim to miniaturize optical functionalities and integrated photonics [A. Fedotova et al., ACS Photonics 2022]. However, the large-scale application is still challenging as the preparation of such metasurfaces, i.e., by mechano-chemical wafer thinning or lithographic pattering, is usually complex, time-consuming, and expensive. We try to address this problem and present a novel method of metasurface patterning based on parallel additive capillary stamping of LiNbO3 on an ITO substrate [F. Alarslan et al., Advanced Engineering Materials 2021, 24(6)]. This technique offers the advantage of rapid, easily customizable and cheap structuring of layers with thicknesses on the order of 100 nm. Nonlinear optical investigations performed with the TIGER microscope show a homogeneous second harmonic generation (SHG) of the surface coinciding with the LiNbO3 film structured by hexagonally arranged macropores. The additional implementation of gold nanoparticles at the position of the macropores allows for a drastic enhancement of the SHG by exploiting plasmonic resonances. Financial support by the ERC (project 646742 INCANA) and DFG (projects IM 37/12-1, FOR 5044 and INST 190/165-1) is gratefully acknowledged.