Design of microstrip-line coupled kinetic inductance detectors for near infrared astronomy

TL;DR

This paper details the design and simulation of a microstrip-line coupled kinetic inductance detector array for near-infrared astronomy, emphasizing fabrication simplicity and low crosstalk.

Contribution

It introduces a microstrip feedline design for KIDs, improving fabrication ease and demonstrating low crosstalk through simulation for astronomical applications.

Findings

Array contains 104 resonators with frequencies from 4.899 GHz to 6.194 GHz

Microstrip feedlines eliminate the need for air bridges, simplifying fabrication

Frequency crosstalk is less than 50 kHz in simulations

Abstract

Kinetic inductance detectors (KID) have great potential in astronomical observation, such as searching for exoplanets, because of their low noise, fast response and photon counting characteristics. In this paper, we present the design process and simulation results of a microstrip line coupled KIDs array for near-infrared astronomical observation. Compared with coplanar waveguide (CPW) feedlines, microstrip feedlines do not require air bridges, which simplify fabrication process. In the design part, we mainly focus on the impedance transforming networks, the KID structure, and the frequency crosstalk simulations. The test array has a total of 104 resonators with 8 rows and 13 columns, which ranges from 4.899~GHz to 6.194~GHz. The pitch size is about 200~$\mu$m and the frequency crosstalk is less than 50~kHz in simulation.