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arXiv · 1909.10316

A Composite Phononic Crystal Design for Quasiparticle Lifetime Enhancement in Kinetic Inductance Detectors

Tuomas A. Puurtinen·Karwan Rostem·Pieter J. de Visser·Ilari J. Maasilta
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Abstract

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 um 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 simulations over a 40 dB attenuation in transmitted power is found for the crystal, which was previously estimated to give a lifetime enhancement of nearly two orders of magnitude.

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Tuomas A. Puurtinen, Karwan Rostem, Pieter J. de Visser, Ilari J. Maasilta. 2019-09-23. A Composite Phononic Crystal Design for Quasiparticle Lifetime Enhancement in Kinetic Inductance Detectors. https://doi.org/10.1007/s10909-020-02423-4

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