Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Poster Wednesday: Plasmonics and Nanooptics
O 64.2: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B1
Symmetry-induced coupling of plasmonic metasurfaces and WS2 — •Florian Spreyer1, Feng Shun2, Yu Ting2, and Thomas Zentgraf1 — 1Department of Physics, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — 2Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
Recent studies show great potential for transition metal dicholgenides (TMD) and their optical application. By downscaling TMD*s to a monolayer flake of atomical thickness, TMD*s become semiconductors with a direct band gap. These monolayer flakes can be used to fabricate hybrid metasurfaces combining plasmonic nanoantennas and a monolayer of TMD. Hybrid metasurfaces with TMD*s with a band gap in the visible regime show great potential for an enhanced light matter interaction for nonlinear applications. Here we, investigate the coupling between a metasurface made of plasmonic C3 gold nanoantennas and a monolayer of tungsten disulfide (WS2). We present recent results of the characterization of WS2 flakes transferred to different substrates. By using photoluminescence and nonlinear measurements, we locate monolayers of WS2 and the orientation of the symmetry axis. On top of the WS2, we fabricate the plasmonic nanoantennas with different orientations and study their influence on the nonlinear properties by SHG spectroscopy.