Strong Negative Electrothermal Feedback in Thermal Kinetic Inductance Detectors

Abstract

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 $\mathcal{L}$ $\approx$ 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.

8 pages, 9 figures, The following article has been submitted to the Journal of Applied Physics. After it is published, it will be found at https://publishing.aip.org/resources/librarians/products/journals/

References in corpus (2)

• A Transition-edge Sensor-based X-ray Spectrometer for the Study of Highly Charged Ions at the National Institute of Standards and Technology Electron Beam Ion Trap
• Electrothermal Model of Kinetic Inductance Detectors