Abstract
Using accurate band structures of , , and two alloys, we calculate the change in refractive index caused by the photoexcited electrons and holes. The effects of both free-carrier absorption (FCA) and one-photon absorption are considered. We find that the change in refractive index varies nonlinearly with the density of photoexcited carriers and that the generally neglected FCA contribution is significant in , owing to its weak spin-orbit coupling.
© 2006 Optical Society of America
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