Photonic crystal for graphene plasmons

ORAL

Abstract

Graphene surface plasmon polaritons (SPPs) are hybrid excitations of electrons and photons which can be controlled by the optical properties of graphene. Periodically varying the optical properties results in a photonic crystal for graphene SPPs. Here we utilize cryogenic near-field optical microscopy to study the band structure induced by a graphene photonic crystal consisting of a high-mobility graphene atop a patterned SiO2 dielectric layer [Xiong, Nat. Commun. 10: 4780 (2019)]. Gating through the dielectric provides a periodic field effect that spatially modulates local carrier densities [Forsythe, Nat. Nanotech. 13, 566–571 (2018)] and the propagation of plasmon polaritons through the graphene. A full plasmonic bandgap and characteristic SPP propagation properties are revealed. Selective engineering of domain wall in the middle of the photonic crystal produces localized SPP modes propagating strictly along the domain wall. These findings signify a new route towards designer-engineered band-structures to route and manipulate highly confined plasmons within high mobility graphene devices.

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Presenters

  • Lin Xiong

    • Department of Physics, Columbia University
    • Columbia Univ
    • Columbia University

Authors

  • Lin Xiong

    • Department of Physics, Columbia University
    • Columbia Univ
    • Columbia University

  • Carlos Forsythe

    • Columbia Univ
    • Columbia University

  • Minwoo Jung

    • Cornell University

  • Alexander S McLeod

    • Columbia University
    • Department of Physics, Columbia University
    • Columbia Univ

  • Yutao Li

    • Columbia Univ
    • Columbia University

  • Shuai Zhang

    • Department of Physics, Columbia University
    • Columbia Univ
    • Columbia University

  • Yinan Dong

    • Columbia Univ
    • Columbia University

  • Song Liu

    • Kansas State University

  • Michael Fogler

    • University of California, San Diego
    • Department of Physics, University of California San Diego
    • UC San Diego
    • Department of Physics, University of California, San Diego
    • UCSD
    • University of California San Diego

  • James Edgar

    • Chemical Engineering, Kansas State University
    • Kansas State University
    • Tim Taylor Department of Chemical Engineering, Kansas State University

  • Gennady Shvets

    • Cornell University

  • Cory Dean

    • Columbia University
    • Department of Physics, Columbia University
    • Physics, Columbia University
    • Columbia Univ

  • Dimitri N Basov

    • Columbia Univ
    • Columbia University