Infrared Nanoscopy of Dirac Plasmons at the Graphene–SiO2 Interface
Nano Letters2011Vol. 11(11), pp. 4701–4705
Citations Over TimeTop 1% of 2011 papers
Zhe Fei, Gregory Andreev, Wenzhong Bao, Lingfeng M. Zhang, Alexander McLeod, Chen Wang, M. K. Stewart, Zeng Zhao, G. Domínguez, M. H. Thiemens, M. M. Fogler, Michael J. Tauber, A. H. Castro Neto, Chun Ning Lau, F. Keilmann, Dimitri 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.
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