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

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arxiv 2207.02497 v1 pith:ICZD7MG4 submitted 2022-07-06 physics.ins-det

Paul Nicaise , Jie Hu , Jean-Marc Martin , Samir Beldi (ESME Sudria) , Christine Chaumont , Piercarlo Bonifacio , Michel Piat (APC) , Hervé Geoffray (CNES)
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Faouzi Boussaha
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classification physics.ins-det
keywords opticalreflectiveabsorbercouplingdetectorsinductancekineticmeander
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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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