Abstract
Recently photoexcited asymmetric superiattices were shown to undergo significant photoinduced birefringence resulting from the screening of internal electric fields. Refractive index changes greater than 3 × 10−4 were observed in assymetric δ-doped N-I-P-I superlattices with a pump fluence of 40 fJ/μm2.1,2 By using picosecond time-resolved photoluminescence3 we show that the two-dimensional character of the confined carriers prevents complete screening of the internal electric fields of the dopants. We have also measured the tunneling-assisted recombination rates and have found that the observed lifetimes are consistent with the calculated wave functions.
© 1991 Optical Society of America
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