SubMM wave superconducting hot-electron direct detectors
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In this study we have measured mixers with a wide range of twin-slot antennas with slot lengths ranging from 26 meu up to 152 meu.
A number of on-going astrophysical and atmospheric programs are aimed at spectroscopic exploration of the terahertz (THz) frequency range. There is an urgent need here for low-noise mixers for heterodyne receivers.
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The operation of a new AlSb/InAs heterojunction bipolar transistor is studied. The electrons are injected into a p-InAs base across the AlSb/InAs heterojunction. The conduction-band discontinuity at this heterojunction is sufficiently large so that energy of the electrons injected into InAs exceeds the threshold for generating electron-hole pairs by impact ionization. The observed incremental common base current at zero collector-base bias decreases and becomes negative as the emitter current is increased, thus providing direct evidence for impact ionization entirely by band-edge discontinuities.
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