Enhanced optical detection in a Josephson junction

Author

Wire, M.S. ; Heflinger, L.O. ; Dalrymple, B.J. ; Leung, M. ; Pham, T. ; Eaton, L.R. ; Silver, A.H.

Author_Institution

TRW Space & Technol. Group, Redondo Beach, CA, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

2107

Lastpage

2110

Abstract

Shifting of the energy gap of a Nb Josephson junction under direct optical illumination was measured. The response is linear with optical input power over more than five orders of magnitude and is nearly independent of temperature from 4 to 8 K. The rise time of this signal is faster than the 2- mu s rise time of the chopped light signal. These direct signals are 500 to 1500 times larger than those obtained when the same optical power is focused elsewhere on the substrate. This enhanced direct response is interpreted as resulting from thermal isolation of the Josephson junction from the substrate due to thermal boundary resistance.<>

Keywords

Josephson effect; bolometers; infrared detectors; niobium; superconducting energy gap; superconducting junction devices; type II superconductors; 4 to 8 K; IR detectors; Josephson junction; Nb junction; bolometers; direct optical illumination; energy gap shifting; enhanced optical detection; rise time; thermal boundary resistance; thermal isolation; Electrons; Frequency; Josephson junctions; Lattices; Lighting; Niobium; Optical detectors; Optical pumping; Temperature; Thermal resistance;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233440

Filename

233440