ISSTT Proceedings

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A Non-Bolometric Model for a Tunable Antenna-Coupled Intersubband Terahertz (TACIT) Detector

Authors:
C. L. Cates, G. Briceno, M. S. Sherwin, K. D. Maranowski, A. C. Gossard
Abstract:
A number of Terahertz applications require detectors with time constants around 1 ns or less and with a certain minimum sensitivity. Detectors are still being developed to fill this niche in the few Terahertz frequency range. We propose a tunable antenna-coupled intersubband Terahertz (TACIT) detector that is expected to be more sensitive than available fast detectors. When Terahertz radiation is incident on the device, a planar metal antenna couples the oscillating electric field from free space to the quantum well heterostructure, with the field polarization perpendicular to the plane of the quantum wells. Electrons in the active region of the channel quantum wells absorb the far-infrared radiation, exciting them from the ground to the first excited subband. The subbands are engineered to have different electron mobilities. As absorption alters the proportion of the electrons that are in the excited subband, the effective mobility of the device changes. A current is applied to the active area of the channel quantum well through source and drain contacts, and the change in effective mobility is detected as a change of the in-plane resistance of the device.
Categories:
Backends, Detectors
Year:
1998
Session:
12
Full-text:
Download a PDF of this paper.
Page Number(s):
597-606