Photonic crystal for graphene plasmons

ORAL

Abstract

Recent advancements in high-quality graphene devices enable long-lived surface plasmon polaritons which propagate over several microns. Various tunable parameters including gate voltage, twist angle, and superlattice potential enable efficient control of device functionalities. We used near-field nano-imaging techniques to study graphene plasmonic crystals at cryogenic temperatures. High-mobility graphene is transferred to a periodically patterned SiO2 substrate with Si back-gate. This heterostructure imprints the graphene with 80 nm-scale periodic variations in carrier density under application of a field effect, thus forming a gate-tunable photonic crystal for plasmons. We observed the formation of a selectively engineered full plasmonic bandgap where propagation of plasmons is strongly suppressed within the superlattice. Additionally, we implemented a designed domain wall within the superlattice which simultaneous supports strongly confined 1D plasmons within the plasmonic bandgap. 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

    • Physics, Columbia University
    • Columbia University

Authors

  • Lin Xiong

    • Physics, Columbia University
    • Columbia University

  • Carlos Forsythe

    • Columbia University

  • Alexander Swinton McLeod

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

  • Minwoo Jung

    • Cornell university

  • Sai Sunku

    • Department of Applied Physics and Mathematics, Columbia University in the City of New York
    • Department of Physics, Columbia University, New York 10027
    • Columbia University

  • GuangXin Ni

    • Physics, Columbia University
    • Columbia University

  • Song Liu

    • Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506, USA.
    • Kansas State University

  • Michael Fogler

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

  • James H. Edgar

    • Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506, USA.
    • Kansas State University
    • Tim Taylor Dept. of Chemical Engineering, Kansas State University

  • Gennady Shvets

    • Cornell University
    • Cornell university

  • Cory Dean

    • Columbia University
    • Department of Physics, Columbia University

  • Dimitri Basov

    • Department of Physics, Columbia University in the City of New York
    • Department of Physics, Columbia University, New York 10027
    • department of physics, columbia university
    • Department of Physics, Columbia University
    • Physics, Columbia University
    • Columbia University