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Nano Lett. 2016 Jul 13;16(7):4391-5. doi: 10.1021/acs.nanolett.6b01517. Epub 2016 Jul 1.

Giant Faraday Rotation of High-Order Plasmonic Modes in Graphene-Covered Nanowires.

Author information

1
Department of Radio-Physics and Electronics, Chelyabinsk State University , Br. Kashirinykh Street 129, 454001 Chelyabinsk, Russian Federation.
2
South Ural State University (National Research University) , 76 Lenin Prospekt, Chelyabinsk 454080, Russian Federation.
3
Kotelnikov Institute of Radio-engeneering and Electronics of RAS , 11/7 Mokhovaya Street, Moscow 125009, Russian Federation.
4
Institut des Molécules et Matériaux du Mans, UMR CNRS 6283, Université du Maine , 72085 Le Mans cedex, France and.
5
Abteilung Physikalische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft , Faradayweg 4-6, 14195 Berlin, Germany.

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 SPPs 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° on the length scale of about 500 nm at mid-infrared frequencies. Tuning the 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.

KEYWORDS:

Magneto-plasmonics; giant Faraday rotation; graphene; nanowires

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