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Title: Excitation, detection, and electrostatic manipulation of terahertz-frequency range plasmons in a two-dimensional electron system
Authors: Wu, J
Mayorov, A.S 
Wood, C.D
Mistry, D
Li, L
Muchenje, W
Rosamond, M.C
Chen, L
Linfield, E.H
Davies, A.G
Cunningham, J.E
Issue Date: 2015
Publisher: Nature Publishing Group
Citation: Wu, J, Mayorov, A.S, Wood, C.D, Mistry, D, Li, L, Muchenje, W, Rosamond, M.C, Chen, L, Linfield, E.H, Davies, A.G, Cunningham, J.E (2015). Excitation, detection, and electrostatic manipulation of terahertz-frequency range plasmons in a two-dimensional electron system. Scientific Reports 5 : 15420. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Terahertz frequency time-domain spectroscopy employing free-space radiation has frequently been used to probe the elementary excitations of low-dimensional systems. The diffraction limit, however, prevents its use for the in-plane study of individual laterally-defined nanostructures. Here, we demonstrate a planar terahertz frequency plasmonic circuit in which photoconductive material is monolithically integrated with a two-dimensional electron system. Plasmons with a broad spectral range (up to ~ 400 GHz) are excited by injecting picosecond-duration pulses, generated and detected by a photoconductive semiconductor, into a high mobility two-dimensional electron system. Using voltage modulation of a Schottky gate overlying the two-dimensional electron system, we form a tuneable plasmonic cavity, and observe electrostatic manipulation of the plasmon resonances. Our technique offers a direct route to access the picosecond dynamics of confined electron transport in a broad range of lateral nanostructures.
Source Title: Scientific Reports
ISSN: 2045-2322
DOI: 10.1038/srep15420
Rights: Attribution 4.0 International
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