Abstract
The generation of non-steady-state photo-emf in an adaptive photodetector made of semi-insulating GaAs is studied. Single-and double-frequency excitation modes are considered. It is found that a contact component of the photocurrent arises in the detector when the spatial frequencies of the interference pattern and phase modulation frequencies are low. The contact signal, being sensitive to a slow drift of the interference pattern, adversely affects the adaptive properties of the device. It is shown theoretically and confirmed experimentally that the contact emf signal at the frequency of basic phase modulation can effectively be suppressed by specially selecting the amplitude of additional phase modulation and the spatial frequency of the interference pattern. The spectral components of the non-steady-state emf signal are calculated for the double-frequency excitation mode.
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Translated from Zhurnal Tekhnichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 72, No. 10, 2002, pp. 79–84.
Original Russian Text Copyright © 2002 by Bryushinin, Kulikov, Sokolov.
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Bryushinin, M.A., Kulikov, V.V. & Sokolov, I.A. Volume and contact photo-emf in GaAs adaptive photodetectors. Tech. Phys. 47, 1283–1290 (2002). https://doi.org/10.1134/1.1514809
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DOI: https://doi.org/10.1134/1.1514809