Optical detection in thin granular films of Y-Ba-Cu-O at temperatures between 4.2 and 100 K

Leung, M.; Broussard, P. R.; Claassen, J. H.; Osofsky, M.; Wolf, S. A.; Strom, U.
December 1987
Applied Physics Letters;12/14/1987, Vol. 51 Issue 24, p2046
Academic Journal
It is demonstrated here that granular films of Y-Ba-Cu-O may serve as optical detectors, operating at wavelengths from the visible to the far infrared, at temperatures well above that of liquid helium. Preliminary measurements using a blackbody source show that an upper bound of the minimum detectable power is 1 μW. The response time as determined by a pulsed far-infrared source is of the order 20 ns. Methods to improve the sensitivity will be discussed.


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