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