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Proceedings Paper

High Tc superconductor tunnel junctions for photon detectors
Author(s): John Zasadzinski
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Paper Abstract

SIS tunnel junctions on high Tc superconductors, when operated as quasiparticle mixers, offer the possibility of low- noise photon detection in the THz regime. Such devices require junctions with sharp current onsets at the gap voltage, 2A/e, and low sub-gap conductances. The bismuthate, Bai_xKxBi03, (Tc=25K) displays ideal , BCS, quasiparticle characteristics at low temperatures, however, at temperatures (T—Tc/2) there is evidence of strong quasiparticle damping which may inhibit device performance. The cuprates typically display non-ideal quasiparticle characteristics but recent data for the new Hg- based cuprates (Tc=96K) are promising in that they display very low and flat sub-gap conductances. Proximity effect tunnel junctions on Bi2Sr2CaCu208/Au bilayers show improved sub-gap characteristics and indicate that this approach may be suitable for mixer development.

Paper Details

Date Published: 1 January 1994
PDF: 2 pages
Proc. SPIE 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994, 22505Y (1 January 1994); doi: 10.1117/12.2303231
Show Author Affiliations
John Zasadzinski, Illinois Institute of Technology (United States)

Published in SPIE Proceedings Vol. 2250:
International Conference on Millimeter and Submillimeter Waves and Applications 1994
Mohammed N. Afsar, Editor(s)

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