Abstract
The authors have demonstrated the operation of a simple optical bolometer by irradiating a constriction in a Y1Ba2Cu3O7- delta thin film with chopped laser light at lambda =633 nm. The change in film resistivity was measured by lock-in detection of the AC component in the current-biased mode. Operating optimally near 77 K, the bolometer shows detectivity of 5 mV W-1 and NEP of 10-6 W Hz-12/. The authors discuss the possibility of methods to improve these figures by at least three orders of magnitude.
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