Infrared Nanoscopy of Dirac Plasmons at the Graphene–SiO2 Interface
- 5 October 2011
- journal article
- letter
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 11 (11), 4701-4705
- https://doi.org/10.1021/nl202362d
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 SiO2 substrate. Our data augmented by detailed modeling establish graphene as a new medium supporting plasmonic effects that can be controlled by gate voltage.Keywords
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