| Literature DB >> 21972938 |
Zhe Fei1, Gregory O Andreev, Wenzhong Bao, Lingfeng M Zhang, Alexander S McLeod, Chen Wang, Margaret K Stewart, Zeng Zhao, Gerardo Dominguez, Mark Thiemens, Michael M Fogler, Michael J Tauber, Antonio H Castro-Neto, Chun Ning Lau, Fritz Keilmann, Dimitri N Basov.
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 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.Entities:
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Year: 2011 PMID： 21972938 DOI： 10.1021/nl202362d
Source DB: PubMed Journal: Nano Lett ISSN： 1530-6984 Impact factor: 11.189