Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 48: Poster: 2D Materials beyond Graphene: TMDCs, Silicene and Relatives
O 48.3: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
Coupling of plasmonic metasurfaces to WS2 monolayers — •Florian Spreyer1, Feng Shun2, Yu Ting2, and Thomas Zentgraf1 — 1Universität Paderborn, Paderborn, Germany — 2Nanyang Technological University, Division of Physics and Applied Physics, Singapore
Recent studies show great potential for transition metal dichalcogenides (TMD) and their optical application. By downscaling TMD’s to a single layer flake of atomical thickness, like it is done with graphene, TMD’s become semiconductors with a direct band gap. In the past years, new ways of fabrication provided greater flake sizes and higher quality of single layer flakes. Here we study hybrid metasurfaces by combining TMD monolayer flakes with plasmonic nanostructures. We present recent results of the characterization of tungsten disulfide (WS2) flakes transferred to different substrates. By using photoluminescence and AFM measurements we locate monolayers of WS2 and determine their thickness. In addition, metasurfaces made of plasmonic gold nanoantennas with a rotational C3 symmetry are designed and characterized. The plasmonic nanoantennas are fabricated on top of the WS2 monolayers and the optical properties are studied in the experiment.