Dresden 2026 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 20: Poster I

HL 20.25: Poster

Tuesday, March 10, 2026, 18:00–20:00, P1

Investigating few-layer 3R-MoS₂ on top of laser-written waveguides — •Elisabeth Grune¹, Alina Schubert¹, Karoline Becker¹, Rico Schwartz¹, Andreas Thies², Alexander Szameit¹, Takashi Taniguchi³, Kenji Watanabe³, Matthias Heinrich¹, and Tobias Korn¹ — ¹Insitute of Physics, University of Rostock, Rostock, Germany — ²Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Berlin, Germany — ³National Institute for Material Science, Tsukuba, Japan

The properties of 3R-MoS₂, ranging from photoluminescence to second-harmonic generation, have attracted increasing scientific interest in recent years. Our goal is to couple these optical properties evanescently to an laser-written optical waveguide running along the substrate’s surface. As a first step, we manufactured a system containing an hBN-encapsulated few-layer 3R-MoS₂ flake on top of a surface waveguide and investigated its photoluminescence signal in several optical geometries at room temperature as well as under cryogenic conditions. We find that when exciting the sample from above, the waveguide itself emits an unexpectedly high background fluorescence signal compared to the 3R-MoS₂ flake. We also use the waveguide itself to excite the flake, yet find that the previous fluorescence also dominates the spectrum. We discuss strategies for mitigating improving the present structures.

Keywords: 3R-MoS2; laser-written waveguide structures