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Proceedings Paper

Dynamical behaviour of superconducting resonators under readout-frequency, readout-power, and signal-power switching
Author(s): Sarah E. Thompson; Stafford Withington; David Goldie
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Paper Abstract

The sensitivities, saturation powers, and response times of Kinetic Inductance Detectors depend on the degree to which the quasiparticle and phonon temperatures differ when readout and signal power are applied. Previously, we proposed a model for saturation in KIDs, and found that hysteretic switching, which is seen experimentally, emerges from the model in a natural way. Here we extend our work, and show through a diagrammatic rep- resentation of operating-point trajectories that output pulse shapes can be calculated for non-hysteretic and hysteretic changes of state driven by readout-frequency, readout-power, and signal-power pulses. The work has several applications: (i) Understanding quasiparticle and phonon relaxation, and their dependence on film and substrate thickness. (ii) Recovering quasiparticle cooling functions from measurements. (iii) Understanding the relationship between optimum readout power and device and material parameters. (iv) Characterising the time-dependent behaviour of photon-counting KIDs, including nonlinearity and pile up.

Paper Details

Date Published: 24 September 2012
PDF: 15 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84520N (24 September 2012); doi: 10.1117/12.925139
Show Author Affiliations
Sarah E. Thompson, Univ. of Cambridge (United Kingdom)
Stafford Withington, Univ. of Cambridge (United Kingdom)
David Goldie, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 8452:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Wayne S. Holland, Editor(s)

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