http://arxiv.org/abs/2107.12493
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.
S. Agrawal, B. Steinbach, J. Bock, et. al.
Wed, 28 Jul 21
4/68
Comments: 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 this https URL