Enhanced quantum efficiency internal photoemission detectors by grating coupling to surface plasma waves

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Abstract
Enhanced quantum efficiencies have been obtained for Au‐InP internal photoemission detectors using grating coupling of incident radiation into surface plasma waves confined to the air‐metal interface. Enhancements of over a factor of 30 are observed at the resonance coupling angles. A model calculation of the surface plasma wave coupling is in good qualitative agreement with the experiment. Time‐resolved response measurements show that the present detectors are capacitance limited; picosecond response speeds are attainable with lower carrier concentration materials and smaller active areas.