Giant Faraday rotation of high-order plasmonic modes in graphene-covered nanowires

Authors:
  • DKDmitry A. Kuzmin
    Dmitry A. Kuzmin
  • IBIgor V. Bychkov
    Igor V. Bychkov
  • VSVladimir G. Shavrov
    Vladimir G. Shavrov
  • VTVasily V. Temnov
    Vasily V. Temnov
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Abstract
Plasmonic Faraday rotation in nanowires manifests itself in the rotation of the spatial intensity distribution of high-order surface plasmon polariton (SPP) modes around the nanowire axis. Here we predict theoretically the giant Faraday rotation for SPP propagating on graphene-coated magneto-optically active nanowires. Upon the reversal of the external magnetic field pointing along the nanowire axis some high-order plasmonic modes may be rotated by up to ~ 100 degrees on scale of about 500 nm at mid-infrared frequencies. Tuning carrier concentration in graphene by chemical doping or gate voltage allows for controlling SPP-properties and notably the rotation angle of high-order azimuthal modes. Our results open the door to novel plasmonic applications ranging from nanowire-based Faraday isolators to the magnetic control in quantum-optical applications.
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