Photodetecting device having Josephson junctions

Details Photodetecting device having Josephson junctions Photodetecting device having Josephson junctions

1984-05-07

1985-06-04

Welsh, John D.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

357 5, 250208, H01L 3922

Patent

active

045216827

ABSTRACT:
A photodetecting device having Josephson junctions, comprises an insulating substrate, a polycrystalline superconductor film formed on the insulating substrate such that Josephson junctions are formed at grain boundaries, the superconductor film having a first region subjected to light illumination, and second and third regions formed contiguously at both sides of the first region such that a width of each of the second and third regions is wider than that of the first region, an input circuit for supplying a predetermined bias current between the second and third regions, and an output circuit for detecting a change in voltage between the second and third regions, one terminal of said input circuit and one terminal of said output circuit being commonly grounded, wherein the superconductor film comprises BaPb.sub.1-x Bi.sub.x O.sub.3 (where 0.32.ltoreq.x.ltoreq.0.35). This simple photodetecting device can detect an optical signal at high speed with high sensitivity.

REFERENCES:
patent: 4316785 (1982-02-01), Suzuki et al.

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