Plasmon-exciton interaction in gold nanotriangle covered MoSe<sub>2</sub> monolayers

POSTER

Abstract

We investigate the interaction between plasmons and excitons in gold nanostructure decorated MoSe2 layers. The monolayers are mechanically exfoliated and transferred using an all-dry viscoelastic stamping technique onto a sapphire substrate. The photoluminescence of bare single and bilayer MoSe2 samples at room temperature revealed exciton emission at 786 nm in the single layer and 807 nm in the bilayer. The PL intensity of the bilayer is quenched by an order of magnitude due to its indirect bandgap. The monolayers are covered with a gold nanotriangle (NT) array using nanosphere lithography with polystyrene beads. The shape and the height of the gold NTs were determined with Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). The plasmon resonance of the gold NT arrays was investigated with transmission measurements and compared with COMSOL simulations as a function of gold triangle height and polystyrene diameter. Coupling between the gold NT plasmon resonance and the exciton emission of the MoSe2 monolayer is examined using photoluminescence and transmission measurements.

*Support from the National Science Foundation (NSF, grant DMR-2004768), the Graduate Student Government (GSG) at the University of Cincinnati, John Hauck Foundation at Xavier University, and Najran University are gratefully acknowledged.

Presenters

  • Samia Alyami

    • *Department of Physics, University of Cincinnati, Cincinnati, OH 45221, USA *Department of Physics, Najran University, Najran 11001, KSA

Authors

  • Samia Alyami

    • *Department of Physics, University of Cincinnati, Cincinnati, OH 45221, USA *Department of Physics, Najran University, Najran 11001, KSA

  • Matthew Larson

    • Department of Physics, University of Cincinnati, Cincinnati, OH 45221, USA

  • Hans Peter Wagner

    • Department of Physics, University of Cincinnati, Cincinnati, OH 45221, USA
    • University Of Cincinnati
    • University of Cincinnati

  • Yang Pan

    • Semiconductor Physics and Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, D-09107 Chemnitz, Germany

  • Lu He

    • Semiconductor Physics and Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, D-09107 Chemnitz, Germany

  • Dietrich RT Zahn

    • Semiconductor Physics and Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, D-09107 Chemnitz, Germany

  • Heidrun Schmitzer

    • Department of Physics, Xavier University, Cincinnati, OH 45207, USA
    • Xavier University