Sharp coupling anomalies exist in a SiGe superlattice buried in a silicon-on-insulator waveguide structure. We study these anomalies using a rigorous coupled wave analysis and examine their suitability for silicon-compatible waveguide-mode resonant filters for optical telecommunications. Active functions could include optical detection, switching, and modulation. We predict that a very weak, sub band-edge absorption can improve filter contrast or provide high quantum efficiency detection.
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