Superconducting Oxide Films for Multispectral Infrared Sensors
Abstract
We have investigated optical detection in epitaxial and granular films of YBa2Cu307-Delta, at wavelengths of 0.63, 3.39, and 10.6 micrometers, at temperatures from 4.2K to 100K. Epitaxial films, and granular films fabricated at Westinghouse, exhibit an optically-induced voltage shift, Delta V, which is proportional to the temperature derivative of the sample dc resistance at the same bias current. Granular films provided by the University of Texas, which exhibit 'semiconducting' resistive behavior, exhibit a response which deviates from dR/dT, but which can be explained in terms of the temperature dependence of the film thermal conductance. The response time of all films is long and strongly wavelength dependent, varying from of order microseconds at 0.63 micrometers to tenths of a second at 3.39 micrometers. Our results indicate that all these films exhibit only bolometric or thermal detection, with no evidence for quantum or non-equilibrium effects in this temperature range. Superconductivity, High temperature, Infrared, Optical, Yttrium barium copper oxide, Thin films, Detection, Epitaxial, Granular.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 07, 1989
- Accession Number
- ADA206685
Entities
People
- A. I. Braginski
- M. G. Forrester