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, Early online. DOI: 10.1007/s10909-020-02423-4
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Journal of Low Temperature PhysicsDate
2020Copyright
© 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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https://converis.jyu.fi/converis/portal/detail/Publication/35056101
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Academy of FinlandFunding program(s)
Academy Project, AoF