Abstract
The polaritonlike excitations in piezoelectric-modulated superlattices are studied systematically by combining the plane wave expansion method and transfer matrix method; these two complementary methods yield the full band structures of the system and mode-coupling information with the external incident waves. Both the band structures and transmission spectra are calculated and analyzed for superlattices made of LiNbO3, and the polaritonlike band gap sdivided by midgap frequencyd of 19% is found in the computed transmission spectra of electromagnetic wave. Furthermore, our study shows that the transmission spectra depend sensitively on the sample thickness and the well defined polaritonlike band gap takes shape only when the number of periods exceeds 10 000. Our results offer a natural explanation as to why previous experiments failed to observe the gap in a sample with 250 periods.
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