Journal
NANO LETTERS
Volume 11, Issue 11, Pages 4701-4705Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202362d
Keywords
Graphene; Dirac plasmon; infrared nanoscopy; near-field microscopy
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Funding
- ONR
- DOE
- AFOSR
- NASA
- MURI
- Deutsche Forschungsgemeinschaft through the Cluster of Excellence Munich Centre for Advanced Photonics
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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.
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