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High-frequency rolloff in the response of junction detectors

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Abstract

A model is developed for junction detectors based on the antisymmetric electromagnetic-structure mode for two high-free-carrier-density regions separated by a slightly conductive barrier. The complex propagation constant is shown to increase as the 3/4 power of the frequency in a range defined by the ratio of the barrier conductivity to dielectric coefficient and by the free-carrier relaxation frequency and as the 1/4 power below this frequency range. This is shown to result in a decrease in the visible frequency heterodyne mixing response proportional to the 3/4 power of the intermediate frequency (2.3 dB per decade) from 100 GHz to a few terahertz. A linear inverse-frequency decrease in internal-junction quantum efficiency results for the same frequency range with a constant internal quantum efficiency below this.

© 1985 Optical Society of America

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