Abstract
The possibility of (noncentrosymmetric) bulk dipole-allowed (BDA) in short-period SimGen strained-layer superlattices (SLS) has been proposed theoretically [1]. However, the all-important characteristic features of even-odd period dependence and the two-fold sample azimuthal symmetry of the SH signal were not observed in the recent experiments, even for samples grown on vicinal surfaces with biatomic height steps. [2,3] This discrepancy was attributed to the insufficient growth accuracy in SLS periodicity in their samples, resulting in cancellations from microscopic anti-phase domains.3
© 1996 Optical Society of America
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