Infrared Nanoscopy of Dirac Plasmons at the Graphene-SiO sub(2) Interface

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 fre...

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Bibliographic Details
Published in:Nano letters 2011-01, Vol.11 (11), p.4701-4705-4701-4705
Main Authors: Fei, Zhe, Andreev, Gregory O, Bao, Wenzhong, Zhang, Lingfeng M, McLeod, Alexander S, Wang, Chen, Stewart, Margaret K, Zhao, Zeng, Dominguez, Gerardo, Thiemens, Mark, Fogler, Michael M, Tauber, Michael J, Castro-Neto, Antonio H, Lau, Chun Ning, Keilmann, Fritz, Basov, Dimitri N
Format: Article
Language:English
Subjects:
Confining
Electric potential
Graphene
Infrared
Nanostructure
Plasmonics
Plasmons
Voltage
Wave propagation
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Summary: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 sub(2) substrate. Our data augmented by detailed modeling establish graphene as a new medium supporting plasmonic effects that can be controlled by gate voltage.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl202362d