High Tc superconductor tunnel junctions for photon detectors

John Zasadzinski

doi:10.1117/12.2303231

1 January 1994 High Tc superconductor tunnel junctions for photon detectors

John Zasadzinski

Proceedings Volume 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994; 22505Y (1994) https://doi.org/10.1117/12.2303231
Event: Millimeter and Submillimeter Waves and Applications: International Conference, 1994, San Diego, CA, United States

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 (TÃ¢â‚¬â€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.

Citation Download Citation

John Zasadzinski "High Tc superconductor tunnel junctions for photon detectors", Proc. SPIE 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994, 22505Y (1 January 1994); https://doi.org/10.1117/12.2303231

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