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Author Gildemeister, J. M. ♦ Lee, A. T. ♦ Richards, P. L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ SUPERCONDUCTING DEVICES ♦ BOLOMETERS ♦ FABRICATION ♦ FAR INFRARED RADIATION ♦ ASTROPHYSICS ♦ MICROWAVE RADIATION ♦ RESPONSE FUNCTIONS ♦ NOISE ♦ SILICON NITRIDES
Abstract 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. {copyright} {ital 1999 American Institute of Physics.}
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-02-01
Publisher Place United States
Journal Applied Physics Letters
Volume Number 74
Issue Number 6


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