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Optical switching in phase-shifted metal-semiconductor-metal Bragg reflectors.

An investigation of optical switching in phase-shifted metal–semiconductor–metal Bragg gratings is presented. A silicon-on-insulator waveguide with aluminum interdigitated surface gratings and an amorphous silicon overcoat provided high-contrast, tunable switching characteristics. This structure is one of many potential realizations of a novel class of metal–semiconductor switching devices currently under investigation. We discuss switching dynamics, tuning mechanisms, and potential applications.