Development of MKIDs in the Optical and Near-Infrared Bands for SPIAKID

• Published in: Journal of low temperature physics 2024, Vol.214 (3-4), p.113-124
• Main Authors: Jie, Hu, Paul, Nicaise, Faouzi, Boussaha, Jean-Marc, Martin, Christine, Chaumont, Alexine, Marret, Florent, Reix, Josiane, Firminy, Thibaut, Vacelet, Dung, Pham Viet, Michel, Piat, Elisabetta, Caffau, Piercarlo, Bonifacio
• Format: Article
• Language: English
• Subjects: Arrays; Characterization and Evaluation of Materials; Charge coupled devices; Condensed Matter Physics; Critical temperature; Detectors; Inductance; Infrared astronomy; Infrared spectra; Infrared spectrophotometers; Magnetic Materials; Magnetism; Near infrared radiation; Physics; Physics and Astronomy; Pixels; Resolution; Sciences of the Universe; Sensors; Spectrophotometry
• ISSN: 0022-2291; 1573-7357
• DOI: 10.1007/s10909-023-03018-5

SpectroPhotometric Imaging in Astronomy with Kinetic Inductance Detectors (SPIAKID) aims at designing, building, and deploying on the sky a spectrophotometric imager based on microwave kinetic inductance detectors (MKIDs) in the optical and near-infrared bands. MKIDs show a fast response and the ability to resolve photon energy compared to the conventional Charge-coupled Devices (CCDs). In this paper, we present the design and simulation of the MKID arrays for SPIAKID. The detectors consist of four arrays with each array of 20,000 lumped-element pixels, and each array will be read with 10 readout lines. The meander material of the resonators is trilayer TiN/Ti/TiN to have better uniformity of the critical temperature across the array. We also present the measurement result for a test array with 30 × 30 pixels which is a subset of the designed 2000-pixel array to verify the design and fabrication. The current measured best energy-resolving power R = E / Δ E is 2.4 at λ = 405 nm and the current medium R is around 1.7. We have also observed that the response of the TiN/Ti/TiN is much smaller than expected.