Infrared nanoscopy of Dirac plasmons at the graphene-SiO2 interface

Details Infrared nanoscopy of Dirac plasmons at the graphene-SiO2 interface Infrared nanoscopy of Dirac plasmons at the graphene-SiO2 interface

2011-12-02

arxiv.org/abs/1112.0390v1

Nano Lett., 2011, 11 (11), pp 4701-4705

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 4 figures

Scientific paper

10.1021/nl202362d

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 two 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 SiO2 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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