Hot electron mixers, the potential competition

Details Hot electron mixers, the potential competition Hot electron mixers, the potential competition

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.356..201k&link_type=abstract

In ESA, Proceedings of an ESA Symposium on Photon Detectors for Space Instrumentation p 201-206 (SEE N94-15025 03-19)

Astronomy and Astrophysics

Astronomy

Bolometers, Hot Electrons, Mixing, Submillimeter Waves, Superconductors, Design Analysis, Heterodyning, Radio Astronomy, Research And Development, Semiconductor Devices

Scientific paper

The urgent need in radio astronomy for low noise heterodyne receivers for frequencies above about 500 GHz is discussed. It is not certain that mixers based on superconducting quasiparticle tunneling (SIS mixers) may turn out to be the answer to this need. In order to try to find an alternative way for realizing low noise heterodyne receivers for submillimeter waves, so called hot electron bolometric effects for mixing are now being investigated. Two basically different approaches are tried, one based on semiconductors and one on superconductors. Both methods are discussed. Experimental evidence so far shows that with semiconductor heterostructures, two Dimensional Gas (2DEG) 18 dB conversion loss has been obtained, and of the order of 5 dB using superconductors. Noise has as yet not been experimentally determined. Calculations suggest that the 2DEG mixers may offer of the order of 500 K (or less) DSB at 1 THz, while for superconductor devices still lower noise temperatures are predicted.

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