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Title: Infrared nanoscopy of dirac plasmons at the graphene-SiO2 interface
Authors: Fei, Z.
Andreev, G.O.
Bao, W.
Zhang, L.M.
S. McLeod, A.
Wang, C.
Stewart, M.K.
Zhao, Z.
Dominguez, G.
Thiemens, M.
Fogler, M.M.
Tauber, M.J.
Castro-Neto, A.H. 
Lau, C.N.
Keilmann, F.
Basov, D.N.
Issue Date: 9-Nov-2011
Citation: Fei, Z., Andreev, G.O., Bao, W., Zhang, L.M., S. McLeod, A., Wang, C., Stewart, M.K., Zhao, Z., Dominguez, G., Thiemens, M., Fogler, M.M., Tauber, M.J., Castro-Neto, A.H., Lau, C.N., Keilmann, F., Basov, D.N. (2011-11-09). Infrared nanoscopy of dirac plasmons at the graphene-SiO2 interface. Nano Letters 11 (11) : 4701-4705. ScholarBank@NUS Repository.
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. © 2011 American Chemical Society.
Source Title: Nano Letters
ISSN: 15306984
DOI: 10.1021/nl202362d
Appears in Collections:Staff Publications

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