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

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

Authors

  • Lin Xiong

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

  • Carlos Forsythe

    • Columbia Univ
    • Columbia University

  • Minwoo Jung

    • Cornell University
    • Department of Physics, Cornell University

  • Alexander McLeod

    • Columbia Univ
    • Columbia University
    • Physics, Columbia University

  • Yutao Li

    • Columbia Univ
    • Columbia University

  • Shuai Zhang

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

  • Yinan Dong

    • Columbia Univ
    • Columbia University

  • Song Liu

    • Columbia Univ
    • Department of Chemical Engineering, Kansas State University
    • Columbia University
    • Kansas State University

  • Michael M Fogler

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

  • James H. Edgar

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

  • Gennady Shvets

    • Cornell University
    • School of Applied and Engineering Physics, Cornell University

  • Cory Dean

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

  • Dimitri Basov

    • Columbia Univ
    • Physics, Columbia University