Antenna-coupled superconducting contacts in submillimeter and FIR astronomy

Details Antenna-coupled superconducting contacts in submillimeter and FIR astronomy Antenna-coupled superconducting contacts in submillimeter and FIR astronomy

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994inpht..35..463r&link_type=abstract

Infrared Physics & Technology, Volume 35, Issue 2-3, p. 463-476.

Physics

3

Scientific paper

Advantages and restrictions of an antenna coupled superconductor-isolator-superconductor (SIS) detector are discussed at the example of a 345 GHz open structure receiver. At Submillimeter wavelengths an antenna coupled mixer is cost effective and provides ultimate bandwidth. Heterodyne systems with large IF bandwidth can challenge 3 He bolometers for continuum work. The status of open structure mixers in astronomy is presented. A noise budget based on a mathematical receiver model is in agreement with the measured receiver noise. An antenna coupled SIS detector in a dipole-lens combination has less beam efficiency than a waveguide mounting. As its sensitivity is equally good or better it makes up for its lack in efficiency by a higher transmission. If the junction capacitance is resonated out by a superconducting matching circuit, SIS mixers can approach the quantum noise limit. Fully assembled SIS receivers work at a few times this limit due to unavoidable losses in the signal path. Their application at frequencies up to 1 THz would be appealing for astronomy. A key role in this effort play efficient superconducting matching circuits which can handle the large static capacitance of junctions at operating frequencies much higher than the RC limited corner frequency. Niobuimnitride is a superconductor which exceeds the frequency limit of Niobium. The prospects of this material are addressed and first results are presented.

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