Abstract
In the framework of dielectric continuum theory and applying transfer matrix method, we study the properties of localized interface optical-phonon modes (IOPM's) in triple-constitution semiconductor superlattices (SL's) with a structural defect layer. Numerical results reveal some interesting and novel properties of minigaps and localized IOPM's, substantially different from those of the conventional dual-constituent SL's. We also present a simple physical picture to interpret these properties.
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