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Proceedings Paper

Nonlinear transport in GaAs and HgCdTe by photo mixing
Author(s): Shirun Dong; Rubin Braunstein; Peidong Yang
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Paper Abstract

The carrier lifetime, mobility, and drift velocity are the important parameters of photoconductors. Normally, several independent tests such as conductivity, Hall effect, and decay of photoconductivity, etc., are used to measure these parameters separately. Pc decay sometimes becomes size limited, however, quite a lot of device configurations have small dimensions. Particularly, at low temperature pc decay may be nonexponential, that leads to some errors in the measurement. We applied the photo-mixing technique to measure the transport parameters. When a multimode laser beam is incident upon the photoconductor sample, the carrier generation rate of the sample will contain frequency components made up of the sum, difference, harmonics, and dc components of the incident frequencies as a bias is applied to the sample. We have generalized the theory of photo-mixing for the case of an unmode-locked multimode laser light incident upon a semiconductor. The results yield the photocurrent as a sum of a dc and an ac part.

Paper Details

Date Published: 28 October 1992
PDF: 3 pages
Proc. SPIE 1726, 1992 Shanghai International Symposium on Quantum Optics, (28 October 1992); doi: 10.1117/12.130425
Show Author Affiliations
Shirun Dong, Zhenjiang Shipbuilding Institute (United States)
Rubin Braunstein, Univ. of California/Los Angeles (United States)
Peidong Yang, Univ. of California/Los Angeles (United States)

Published in SPIE Proceedings Vol. 1726:
1992 Shanghai International Symposium on Quantum Optics
Yuzhu Wang; Yiqiu Wang; Zugeng Wang, Editor(s)

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