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arXiv · 2207.02497

Investigation of Optical Coupling in Microwave Kinetic Inductance Detectors using Superconducting Reflective Plates

Paul Nicaise·Jie Hu·Jean-Marc Martin·Samir Beldi·Christine Chaumont·Piercarlo Bonifacio·Michel Piat·Hervé Geoffray·Faouzi Boussaha
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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 Al$_2$O$_3$ dielectric layer to reach the peak photon absorption. We expect the plate to recover undetected photons by reflecting them back onto the absorber.

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Paul Nicaise, Jie Hu, Jean-Marc Martin, Samir Beldi, Christine Chaumont, Piercarlo Bonifacio, Michel Piat, Hervé Geoffray, Faouzi Boussaha. 2022-07-06. Investigation of Optical Coupling in Microwave Kinetic Inductance Detectors using Superconducting Reflective Plates. https://doi.org/10.1007/s10909-022-02789-7

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