PHOTODETECTING DEVICE

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,...

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Bibliographic Details
Main Authors YOICHI ENOMOTO, TOSHIAKI MURAKAMI, MINORU SUZUKI
Format Patent
LanguageEnglish
Published 05.11.1986
Edition4
Subjects
COLORIMETRY
ELECTRICITY
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT
MEASURING
PHYSICS
RADIATION PYROMETRY
TESTING
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Summary: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, a bias 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 bias circuit and one terminal of said output circuit being commonly grounded, wherein the superconductor film comprises BaPb1-xBixO3 (where 0.05</=x<0.32) having an I-V characteristic of weak link type under temperature condition less than transition temperature of said BaPb1-xBixO3. This simple photodetecting device can detect an optical signal at high speed with high sensitivity.
Bibliography:Application Number: GB19840023202