Physics
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apphl..74..868g&link_type=abstract
Applied Physics Letters, Volume 74, Issue 6, id. 868 (1999).
Physics
25
Photoconductors And Bolometers, Superconducting Infrared, Submillimeter And Millimeter Wave Detectors, Bolometers, Infrared, Submillimeter Wave, Microwave, And Radiowave Receivers And Detectors, Superconducting Device Characterization, Design, And Modeling, Radio Telescopes And Instrumentation, Heterodyne Receivers
Scientific paper
We describe the fabrication and characterization of superconducting transition-edge bolometers for astrophysical applications at far-infrared and mm wavelengths. The sensor is voltage biased and the current is measured with a superconducting quantum interference ammeter. Strong negative electrothermal feedback keeps the sensor temperature nearly constant, reduces the response time significantly, and improves linearity. It also makes the responsivity relatively insensitive to changes in optical background loading and refrigerator temperature. The bolometers are made using standard microlithographic techniques suitable for fabrication of large scale arrays. Detailed measurements of optical response are presented for a range of bias conditions and are compared with theory. Measured noise spectra are shown and a model for the noise is presented.
Gildemeister Jan M.
Lee Adrian T.
Richards Paul L.
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