Dynamical behaviour of superconducting resonators under readout-frequency, readout-power, and signal-power switching

Sarah E. Thompson; Stafford Withington; David Goldie

doi:10.1117/12.925139

24 September 2012 Dynamical behaviour of superconducting resonators under readout-frequency, readout-power, and signal-power switching

Sarah E. Thompson, Stafford Withington, David Goldie

Author Affiliations +

Proceedings Volume 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI; 84520N (2012) https://doi.org/10.1117/12.925139
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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.

Citation Download Citation

Sarah E. Thompson, Stafford Withington, and David Goldie "Dynamical behaviour of superconducting resonators under readout-frequency, readout-power, and signal-power switching", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84520N (24 September 2012); https://doi.org/10.1117/12.925139

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