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Highly sensitive optical detectors have been fabricated by using superconducting BaPb0.7Bi0.3O3 (BPB) thin films. Optical signals create quasi-particles and induce energy gap changes which can be detected by Boundary Josephson Junctions (BJJs) in the films. The sensitivity is 104 V/W in the 1.0∼10 µm wavelength range and they can respond up to 500 MHz. This device is useful as a detector in an optical communication system or an infrared spectrometer.
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Enomoto et al. (1984) studied this question.
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