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Composite superconducting transition edge bolometer

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3 Author(s)
Clarke, J. ; Department of Physics, University of California and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 ; Richards, P.L. ; Yeh, N.‐H.

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A composite far‐infrared bolometer has been constructed that uses an aluminum film at the superconducting transition temperature of 1.3 K as the temperature‐sensitive element. The film is evaporated on one edge of a 4×4‐mm sapphire substrate, which is coated on the reverse side with an absorbing film of bismuth. The best bolometer has an electrical NEP of (1.7±0.1) ×10-15 W Hz-1/2 at 2 Hz, and a specific detectivity D* of (1.1±0.1) ×1014 cm W-1 Hz1/2. This measured electrical NEP is within a factor 2 of the fundamental thermal noise limit.

Published in:

Applied Physics Letters  (Volume:30 ,  Issue: 12 )