We present a detailed generalization of the Franz-Keldysh theory of electromodulation which takes into account the presence of a dc surface electric field, scrEdcˢ. We demonstrate rigorously that when the ac modulating electric field is small compared to scrEdcˢ, the period of the Franz-Keldysh oscillations yields scrEdcˢ. This result is independent of the relation between the width of the space-charge region and the penetration depth of light. The effects of broadening also are considered.
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Shen et al. (1990) studied this question.
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