Probing excitonic emission in 2D semiconductors with plasmon-assisted spectroscopy

ORAL

Abstract

Surface plasmon polaritons (SPPs) exhibit electromagnetic fields that are strongly polarized perpendicular to the metal surfaces on which they propagate. As a result, coupling of dipole emission into SPPs can be utilized as a direct probe of dipole orientation. Furthermore, coupling into SPPs can significantly enhance emission rates due to the reduced SPP mode volume. In this work, we couple transition metal dichalcogenide monolayers, which are two dimensional semiconductors, to silver films by mechanical stamping, and study the relative emission of excitonic states into free space versus SPPs. In addition to regular excitons that have been observed previously, we also observe additional emissive states that exhibit highly selectively coupling to SPPs. We will discuss the origin of these states.

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Authors

  • Alexander High

    Harvard University, department of Physics, Harvard University

  • You Zhou

    Harvard University, department of Physics, Harvard University, Department of Physics, Department of Chemistry and Chemical Biology, Harvard University, Harvard University, Department of Physics

  • Giovanni Scuri

    Harvard University, department of Physics, Harvard University, Department of Physics, Harvard University, Harvard University, Department of Physics

  • Alan Dibos

    Harvard University, School of Engineering and Applied Sciences, Harvard University, Harvard University, John A. Paulson School of Engineering and Applied Sciences

  • Chi Shu

    Harvard University

  • Kristiaan de Greve

    Harvard University

  • Mark Polking

    Harvard University, Harvard University, Department of Chemistry and Chemical Biology

  • Dominik Wild

    Harvard University, department of Physics, Harvard University, Department of Physics, Harvard University

  • Luis Juaregui

    Harvard University, department of Physics, Harvard University

  • Andrew Joe

    Harvard University, Harvard University, Physics Department, Harvard University, Department of Physics

  • Kateryna Pistunova

    Harvard University

  • Mikhail Lukin

    Harvard University, Harvard University, department of Physics, Department of Physics, Harvard University, Harvard University, Department of Physics

  • P. Kim

    Harvard University, Department of Physics, Harvard University, Department of Physics, Harvard University, Cambridge, MA 02138, US, Harvard University, department of Physics, Harvard University, Department of Physics, Department of Physics, Harvard University, Cambridge, MA, 02138, Department of Physics, Harvard University, Cambridge, MA 02138

  • Hongkun Park

    Harvard University