Strong negative electrothermal feedback in thermal kinetic inductance detectors
We demonstrate strong negative electrothermal feedback accelerating and linearizing the response of a thermal kinetic inductance detector (TKID). TKIDs are a proposed highly multiplexable replacement to transition-edge sensors and measure power through the temperature-dependent resonant frequency of a superconducting microresonator bolometer. At high readout probe power and probe frequency detuned from the TKID resonant frequency, we observe electrothermal feedback loop gain up to ℒ≈16 through measuring the reduction of settling time. We also show that the detector response has no detectable non-linearity over a 38% range of incident power and that the noise-equivalent power is below the design photon noise.
Additional Information© 2021 Author(s). Published under an exclusive license by AIP Publishing. Submitted: 26 July 2021; Accepted: 14 September 2021; Published Online: 28 September 2021. Our work was carried out at the Jet Propulsion Laboratory, Caltech, under contract from the National Aeronautics and Space Administration. We thank Mark Lindeman and Jonas Zmuidzinas for insightful discussion. Shubh Agrawal's work was supported by the Dr. Gary Stupian SURF Fellowship. Data Availability: The data that support the findings of this study are available from the corresponding author upon reasonable request.
Published - 124503_1_online.pdf
Submitted - 2107-12493.pdf