Sensitivity improvement of granular thin film high tc superconductor fir detection by a post annealing procedure

Gi. Schneider

doi:10.1117/12.2298132

14 December 1992 Sensitivity improvement of granular thin film high tc superconductor fir detection by a post annealing procedure

Gi. Schneider

Author Affiliations +

Proceedings Volume 1929, 17th International Conference on Infrared and Millimeter Waves; 19290F (1992) https://doi.org/10.1117/12.2298132
Event: 17th International Conference on Infrared and Millimeter Waves, 1992, Pasadena, CA, United States

Abstract

The use of high Tc superconducting thin films as detectors for UV to microwave radiation is currently under investigation. Bolometric effects, nonequilibrium electron heating and Josephson video detection have been reported [1]. In the far infrared (FIR), the photon energies are smaller than the BCS energy gap and so Josephson detection in granular films seems the most promising. Granular films represent distributed antennas with the detection occuring at all intergrain weak links. They are therefore especially suitable for multimode detection. The sensitivity of detectors reported varies considerably and a reliable production technique leading to reproducible results has not been reported. We have established that Tl and Bi based thin films can be heat treated under vacuum to increase their sensitivities by several orders of magnitude. Sensitivities exceeding 1V/W are obtained. Presented below are results relating different heat treatments to the photoresponse.

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Gi. Schneider "Sensitivity improvement of granular thin film high tc superconductor fir detection by a post annealing procedure", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19290F (14 December 1992); https://doi.org/10.1117/12.2298132

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