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Kinetic Inductance Photodetectors Based on Nonequilibrium Response in Superconducting Thin-Film StructuresWhile experimental studies of kinetic-inductance sensors have been limited so far by the temperature range near the superconducting transition, these detectors can be very sensitivity at temperatures well below the transition, where the number of equilibrium quasiparticles is exponentially small. In this regime, a shift of the quasiparticle chemical potential under radiation results in the change of the kinetic inductance, which can be measured by a sensitive SQUID readout. We modeled the kinetic inductance response of detectors made from disordered superconducting Nb, NbC, and MoRe films. Low phonon transparency of the interface between the superconductor and the substrate causes substantial re-trapping of phonons providing high quantum efficiency and the operating time of approximately 1 ms at 1 K. Due to the small number of quasiparticles, the noise equivalent power of the detector determined by the quasiparticle generation-recombination noise can be as small as approximately 10(exp -19) W/Hz(exp 1/2) at He4 temperatures.
Document ID
Document Type
Conference Paper
Sergeev, A. V.
(Wayne State Univ. Detroit, MI United States)
Karasik, B. S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Gogidze, I. G.
(Winncom Technologies Corp. Solon, OH United States)
Mitin, V. V.
(Wayne State Univ. Detroit, MI United States)
Date Acquired
August 20, 2013
Publication Date
December 1, 2001
Publication Information
Publication: Proceedings of the Twenlfth International Symposium on Space Terahertz Technology
Subject Category
Electronics And Electrical Engineering
Distribution Limits
Work of the US Gov. Public Use Permitted.

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IDRelationTitle20020038920Analytic PrimaryProceedings of the Twelfth International Symposium on Space Terahertz Technology
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