Position- and Temperature-Dependent Responsivity in a KID-Based Phonon-Mediated Detector
Abstract
We report on the position- and temperature-dependent response of a kinetic inductance phonon-mediated (KIPM) detector. To study position-dependence, we used a controllable mirror attached to a micro-electromechanical system (MEMS) to steer optical light with a 100 μm spot size over the backside of the cryogenic detector. With both pulsed and continuous operation of the LED, we observe features of the detector housing and find that the signal is strongest when the LED is pointed directly at the KID. The "off-KID" response is measured to be 34% of the "on-KID" response and is largely independent of direction. We model phonon propagation and collection in the KIPM detector with G4CMP and assert that the isotropic angular dependence is unlikely to be due to discrete phonon absorption "sinks", such as the microwave feedline or the device mounting points, but can be explained instead by an isotropic energy loss in the crystal. We furthermore utilize the temperature flexibility of the MEMS and KIPM detector system to investigate temperature-dependent responsivity, both at the sensor level (i.e., frequency shifts in the KID) and at the detector level (i.e., position dependence). We fit the KID's response to a two-component heat capacity and present the model as an alternative way to understand the KID's response to absorbed energy. We show on- and off-KID data at a range of temperatures and show that the phonon dynamics are not temperature dependent. We comment on the resulting implication for KID dynamics and design improvements.
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BibTeX
@misc{smith2026position,
title = {{Position- and Temperature-Dependent Responsivity in a KID-Based Phonon-Mediated Detector}},
author = {Z. J. Smith and O. Wen and S. Q. Dang and E. Panner and J. Anczarski and T. Aralis and T. Dyson and S. W. Henderson and H. Magoon and A. Simchony and C. Stone-Whitehead and N. Tabassum and B. A. Young and M. Munaf and D. J. Temples and C. Cap and C. L. Chang and Y. -Y. Chang and M. Garcia-Sciveres and W. Ho and K. Li and X. Li and R. Linehan and M. Lisovenko and K. Okubo and Manabputra and K. Ramanathan and S. Ray and B. Sandoval and A. Suzuki and G. Wang and M. Williams and J. R. Xiong and V. Yefremenko and B. L. T. Plourde and S. R. Golwala and K. Stifter and N. A. Kurinsky},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.39338},
eprint = {2610.39338},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.39338},
}
RIS
TY - UNPB
TI - Position- and Temperature-Dependent Responsivity in a KID-Based Phonon-Mediated Detector
AU - Z. J. Smith
AU - O. Wen
AU - S. Q. Dang
AU - E. Panner
AU - J. Anczarski
AU - T. Aralis
AU - T. Dyson
AU - S. W. Henderson
AU - H. Magoon
AU - A. Simchony
AU - C. Stone-Whitehead
AU - N. Tabassum
AU - B. A. Young
AU - M. Munaf
AU - D. J. Temples
AU - C. Cap
AU - C. L. Chang
AU - Y. -Y. Chang
AU - M. Garcia-Sciveres
AU - W. Ho
AU - K. Li
AU - X. Li
AU - R. Linehan
AU - M. Lisovenko
AU - K. Okubo
AU - Manabputra
AU - K. Ramanathan
AU - S. Ray
AU - B. Sandoval
AU - A. Suzuki
AU - G. Wang
AU - M. Williams
AU - J. R. Xiong
AU - V. Yefremenko
AU - B. L. T. Plourde
AU - S. R. Golwala
AU - K. Stifter
AU - N. A. Kurinsky
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.39338
UR - https://arxiv.org/abs/2610.39338
AB - We report on the position- and temperature-dependent response of a kinetic inductance phonon-mediated (KIPM) detector. To study position-dependence, we used a controllable mirror attached to a micro-electromechanical system (MEMS) to steer optical light with a 100 μm spot size over the backside of the cryogenic detector. With both pulsed and continuous operation of the LED, we observe features of the detector housing and find that the signal is strongest when the LED is pointed directly at the KID. The "off-KID" response is measured to be 34% of the "on-KID" response and is largely independent of direction. We model phonon propagation and collection in the KIPM detector with G4CMP and assert that the isotropic angular dependence is unlikely to be due to discrete phonon absorption "sinks", such as the microwave feedline or the device mounting points, but can be explained instead by an isotropic energy loss in the crystal. We furthermore utilize the temperature flexibility of the MEMS and KIPM detector system to investigate temperature-dependent responsivity, both at the sensor level (i.e., frequency shifts in the KID) and at the detector level (i.e., position dependence). We fit the KID's response to a two-component heat capacity and present the model as an alternative way to understand the KID's response to absorbed energy. We show on- and off-KID data at a range of temperatures and show that the phonon dynamics are not temperature dependent. We comment on the resulting implication for KID dynamics and design improvements.
ER -