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Kinetic Inductance Photodetectors Based on Nonequilibrium Response in Superconducting Thin-Film Structures

Authors:
A.V. Sergeev, B.S. Karasik, I.G. Gogidze, V.V. Mitin
Abstract:
While 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 retrapping of phonons providing high quantum efficiency and the operating time of ~1 ms at about equal to 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 ~10-19 W/[square root]Hz at He4 temperatures.
Categories:
Detectors, Mixers
Year:
2001
Session:
4
Full-text:
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Page Number(s):
112-120