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High T(sub c) Superconducting Bolometer on Chemically Etched 7 Micrometer Thick SapphireA transition-edge IR detector, using a YBa2Cu3O(7-x) (YBCO) thin film deposited on a chemically etched, 7 micrometer thick sapphire substrate has been built. To our knowledge it is the first such high T(sub c) superconducting (HTS) bolometer on chemically thinned sapphire. The peak optical detectivity obtained is l.2 x 10(exp 10) cmHz(sup 1/2)/W near 4Hz. Result shows that it is possible to obtain high detectivity with thin films on etched sapphire with no processing after the deposition of the YBCO film. We discuss the etching process and its potential for micro-machining sapphire and fabricating 2-dimensional detector arrays with suspended sapphire membranes. A 30 micrometer thick layer of gold black provided IR absorption. Comparison is made with the current state of the art on silicon substrates.
Document ID
20000032805
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Lakew, B. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Brasunas, J. C. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Pique, A. (Neocera, Inc. Beltsville, MD United States)
Fettig, R. (Raytheon Co. Lanham, MD United States)
Mott, B. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Babu, S. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Cushman, G. M. (Raytheon Co. Lanham, MD United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 1997
Subject Category
Instrumentation And Photography
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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