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Nano Lett. 2011 Nov 9;11(11):4701-5. doi: 10.1021/nl202362d. Epub 2011 Oct 12.

Infrared nanoscopy of dirac plasmons at the graphene-SiO₂ interface.

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1
Department of Physics, University of California San Diego, La Jolla, California 92093, United States. zfei@physics.ucsd.edu

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.

PMID:
21972938
DOI:
10.1021/nl202362d
[Indexed for MEDLINE]
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