A Composite Phononic Crystal Design for Quasiparticle Lifetime Enhancement in Kinetic Inductance Detectors
Puurtinen, T. A., Rostem, K., de Visser, P. J., & Maasilta, I. J. (2020). A Composite Phononic Crystal Design for Quasiparticle Lifetime Enhancement in Kinetic Inductance Detectors. Journal of Low Temperature Physics, 199(3-4), 577-584. https://doi.org/10.1007/s10909-020-02423-4
Published inJournal of Low Temperature Physics
© The Authors 2020
A nanoscale phononic crystal filter (reflector) is designed for a kinetic inductance detector where the reflection band is matched to the quasiparticle recombination phonons with the aim to increase quasiparticle lifetime in the superconducting resonator. The inductor is enclosed by a 1-μm-wide phononic crystal membrane section with two simple hole patterns that each contain a partial spectral gap for various high-frequency phonon modes. The phononic crystal is narrow enough for low-frequency thermal phonons to propagate unimpeded. With 3D phonon scattering simulation over a 40 dB attenuation in transmitted power is found for the crystal, which is estimated to give a lifetime enhancement of nearly two orders of magnitude.
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Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingOpen access funding provided by University of Jyväskylä. This study was supported by the Academy of Finland Project Number 298667. K. Rostem gratefully acknowledges financial support from a NASA Astrophysics Research and Analysis Grant (NNX17AH83G). P. J. de Visser was financially supported by the Netherlands Organisation for Scientific Research NWO (Veni Grant 639.041.750).
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