Electrically-tunable exciton-plasmon coupling in van der Waals heterostructures

ORAL

Abstract

Two dimensional transition metal dichalcogenide monolayers (TMDMs) are promising candidates for integrated optoelectronic devices. TMDMs can be stacked onto other van der Waals materials and the resulting heterostructures can be transferred onto various functional substrates. In addition, TMDMs exhibit tightly-bound, direct-gap excitons, which can be electrostatically controlled by applying a gate voltage. In this work, we employ such response to realize integrated on-chip optical modulators by coupling excitons in tungsten diselenide (WSe$_{\mathrm{2}})$ based van der Waals heterostructures to plasmonic waveguides fabricated on single crystalline silver. The enhanced light-matter interaction in the integrated nanoplasmonic waveguide-TMDM system allows us to realize high-performance non-resonant electro-optic switches that function both at 4 K and at room temperature.

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Authors

  • 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

  • Alexander High

    Department of Physics, 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

  • Luis Jauregui

    Harvard University, Department of Physics, Harvard University

  • Kristiaan De Greve

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

  • Dominik Wild

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