Nonlinearities in photoresponse of ultrafast optoelectronic switches are investigated by using a novel correlation technique. Sublinear behavior is found to be typical for low average electrical fields and superlinear for electrical fields higher than the threshold of electron negative-differential-mobility effect. The nonlinearities have been explained in terms of the electrical field redistribution.
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Pašiškevičius et al. (1993) studied this question.
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