Investigation of Optical Coupling in Microwave Kinetic Inductance Detectors using Superconducting Reflective Plates
arXiv:2207.02497 · doi:10.1007/s10909-022-02789-7
Abstract
To improve the optical coupling in Microwave Kinetic Inductance Detectors (MKIDs), we investigate the use of a reflective plate beneath the meandered absorber. We designed, fabricated and characterized high-Q factors TiN-based MKIDs on sapphire operating at optical wavelengths with a Au/Nb reflective thin bilayer below the meander. The reflector is set at a quarter-wave distance from the meander using a transparent AlO dielectric layer to reach the peak photon absorption. We expect the plate to recover undetected photons by reflecting them back onto the absorber.
arXiv commentJournal of Low Temperature Physics, Springer Verlag (Germany), In press
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