ISSTT Proceedings

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BIB Photoconductive Mixers

Authors:
A.L. Betz, R.T. Boreiko
Abstract:
Far-infrared mixers using photoconductive elements offer the promise of quantum noise limited performance at frequencies > 2 THz. The device sizes are >2[lambda], so no external antenna is required. Bulk photoconductive mixers, however, must have long absorption lengths because of low doping, and consequently IF bandwidths are limited to 50 MHz. A better device structure using a blocked-impurity-band (BIB) layer allows very high doping in a small device, with a consequent quantum efficiency > 25% and IF bandwidth > 1 GHz, at least in Si-devices. Progress and problems with Ge:Ga mixers for the 2-5 THz range will be discussed along with Si:Sb and Si:As devices for 8-16 THz and 11-22 THz, respectively.
Categories:
Detectors
Year:
1997
Session:
11
Full-text:
Download a PDF of this paper.
Page Number(s):
538-545