We demonstrate that granular films of Y-Ba-Cu-0 can detect broadband optical radiation, at temperatures up to 100 K. A lower bound of D* has been measured and found to be 108 cm-Hz172 /Watt, and a response time of 20 nanoseconds has been determined.
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M Leung, U Strom, P R Broussard, S A Wolf, J. H. Claassen, "Photoconductivity In Granular Films Of Y-Ba-Cu-O," Proc. SPIE 0879, Sensing, Discrimination, and Signal Processing and Superconducting Materials and Intrumentation, (18 May 1988);