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  • Title: Infrared nanoscopy of dirac plasmons at the graphene-SiO₂ interface.
    Author: Fei Z, Andreev GO, Bao W, Zhang LM, S McLeod A, Wang C, Stewart MK, Zhao Z, Dominguez G, Thiemens M, Fogler MM, Tauber MJ, Castro-Neto AH, Lau CN, Keilmann F, Basov DN.
    Journal: Nano Lett; 2011 Nov 09; 11(11):4701-5. PubMed ID: 21972938.
    Abstract:
    We report on infrared (IR) nanoscopy of 2D plasmon excitations of Dirac fermions in graphene. This is achieved by confining mid-IR radiation at the apex of a nanoscale tip: an approach yielding 2 orders of magnitude increase in the value of in-plane component of incident wavevector q compared to free space propagation. At these high wavevectors, the Dirac plasmon is found to dramatically enhance the near-field interaction with mid-IR surface phonons of SiO(2) substrate. Our data augmented by detailed modeling establish graphene as a new medium supporting plasmonic effects that can be controlled by gate voltage.
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