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https://doi.org/10.1021/nl202362d
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. https://doi.org/10.1021/nl202362d | 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 | URI: | http://scholarbank.nus.edu.sg/handle/10635/96936 | ISSN: | 15306984 | DOI: | 10.1021/nl202362d |
Appears in Collections: | Staff Publications |
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