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Proceedings Paper

Terahertz absorption by resonant plasmon excitations in grating-gated quantum wells
Author(s): T. A. Barrick; M. C. Wanke; K. Fortier; A. D. Grine; J. L. Reno; S. K. Lyo; E. A. Shaner; S. J. Allen
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Paper Abstract

Terahertz detection using excitations of plasmon modes offers a high-speed, high resolution, and frequency-selective alternative to existing technology. Plasmons in high mobility quantum well two-dimensional electron gas (2DEG) systems can couple to radiation when either the channel carrier density, or the incident radiation, is spatially modulated with appropriate periodicity. Grating-gated terahertz detectors having a voltage tunable frequency response have been developed based on this principle. A continuous wave THz photomixer was used to characterize the resonant absorption in such devices. At the fundamental 2DEG plasmon frequency, defined by the grating and the quantum well carrier density, a 20% change in transmission was observed. As the resonance is tuned from the 'natural' plasmon frequency through application of a gate bias, it shifts as expected, but the transmission change drops to only a few percent.

Paper Details

Date Published: 12 February 2009
PDF: 7 pages
Proc. SPIE 7215, Terahertz Technology and Applications II, 721509 (12 February 2009); doi: 10.1117/12.808865
Show Author Affiliations
T. A. Barrick, Sandia National Labs. (United States)
M. C. Wanke, Sandia National Labs. (United States)
K. Fortier, Sandia National Labs. (United States)
A. D. Grine, Sandia National Labs. (United States)
J. L. Reno, Sandia National Labs. (United States)
S. K. Lyo, Sandia National Labs. (United States)
E. A. Shaner, Sandia National Labs. (United States)
S. J. Allen, Univ. of California, Santa Barbara (United States)

Published in SPIE Proceedings Vol. 7215:
Terahertz Technology and Applications II
Kurt J. Linden; Laurence P. Sadwick; Créidhe M. O'Sullivan, Editor(s)

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