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Journal Articles Journal of Low Temperature Physics Year : 2022

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

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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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Dates and versions

hal-03714351 , version 1 (05-07-2022)

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Paul Nicaise, Jie Hu, Jean-Marc Martin, Samir Beldi, Christine Chaumont, et al.. Investigation of Optical Coupling in Microwave Kinetic Inductance Detectors using Superconducting Reflective Plates. Journal of Low Temperature Physics, 2022, 209 (5-6), pp.1242-1248. ⟨hal-03714351⟩
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