Optical response of epitaxial and granular films of YBa/sub 2/Cu/sub 3/O/sub 7- delta / at temperatures from 25 K to 100 K

The authors present the results of optical detection in epitaxial and granular films of YBa/sub 2/Cu/sub 3/O/sub 7- delta / at wavelengths of 0.63, 3.39, and 10.6 mu m and at temperatures from 25 K to 100 K. Both types of film exhibit only bolometric detection, with no evidence for nonequilibrium ef...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1989-03, Vol.25 (2), p.1327-1330
Main Authors: Forrester, M.G., Gottlieb, M., Gavaler, J.R., Braginski, A.I.
Format: Article
Language:English
Subjects:
Bridges
Critical current
Current measurement
Mechanical variables measurement
Noise measurement
Optical detectors
Optical films
Radiation detectors
Temperature distribution
Wavelength measurement
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Summary:The authors present the results of optical detection in epitaxial and granular films of YBa/sub 2/Cu/sub 3/O/sub 7- delta / at wavelengths of 0.63, 3.39, and 10.6 mu m and at temperatures from 25 K to 100 K. Both types of film exhibit only bolometric detection, with no evidence for nonequilibrium effects in this temperature range. For 0.63- mu m radiation, mechanically chopped at 725 Hz, measurements of a 10*90 mu m/sup 2/ epitaxial bridge yield a bolometric responsivity of approximately 4*10/sup 3/ V/W, and detectivity D* of more than 10/sup 8/ cm square root Hz/W. Granular films biased above their critical current are found to exhibit two-level switching noise, resulting in Lorentzian deviations from an otherwise 1/f noise spectrum.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.92540