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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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Department of Physics, University of California San Diego, La Jolla, California 92093, United States.


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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