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Proceedings Paper

Electronically tunable plasmonic grating-gate terahertz detectors
Author(s): E. A. Shaner; A. D. Grine; S. K. Lyo; J. L. Reno; M. C. Wanke; S. J. Allen
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Paper Abstract

Split grating-gate field effect transistors (FETs) detectors made from high mobility quantum well two-dimensional electron gas material have been shown to exhibit greatly improved tunable resonant photoresponse compared to single grating-gate detectors due to the formation of a 'diode-like' element by the split-gate structure. These detectors are relatively large for FETs (1mm x 1mm area or larger) to match typical focused THz beam spot sizes. In the case where the focused THz spot size is smaller than the detector area, we have found evidence, through positional scanning of the detector element, that only a small portion of the detector is active. To further investigate this situation, detectors with the same channel width (1mm), but various channel lengths, were fabricated and tested. The results indicate that indeed, only a small portion of the split grating gated FET is active. This finding opens up the possibility for further enhancement of detector sensitivity by increasing the active area.

Paper Details

Date Published: 25 September 2007
PDF: 7 pages
Proc. SPIE 6760, Infrared, Mid-IR, and Terahertz Technologies for Health and the Environment II, 67600B (25 September 2007); doi: 10.1117/12.738968
Show Author Affiliations
E. A. Shaner, Sandia National Labs. (United States)
A. D. Grine, Sandia National Labs. (United States)
S. K. Lyo, Sandia National Labs. (United States)
J. L. Reno, Sandia National Labs. (United States)
M. C. Wanke, Sandia National Labs. (United States)
S. J. Allen, Univ. of California, Santa Barbara (United States)

Published in SPIE Proceedings Vol. 6760:
Infrared, Mid-IR, and Terahertz Technologies for Health and the Environment II
Alexey A. Belyanin; Rebekah A. Drezek; Claire Gmachl, Editor(s)

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