Photodetecting device having Josephson junctions
US4521682A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1984 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | May 7, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/874
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.