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

Brueck, S. R. J.; Diadiuk, V.; Jones, T.; Lenth, W.
May 1985
Applied Physics Letters;5/15/1985, Vol. 46 Issue 10, p915
Academic Journal
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.


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