A multi-chroic kinetic inductance detectors array using hierarchical phased array antenna

TL;DR

This paper introduces a multi-chroic KID array with hierarchical phased array antenna, covering four passbands from 125 to 365 GHz, optimized for high-altitude telescopes, with preliminary measurements demonstrating its potential.

Contribution

It presents a novel multi-chroic KID pixel design integrated with a broadband hierarchical phased-array antenna for improved astronomical observations.

Findings

Design successfully covers four atmospheric windows.

Preliminary measurements with Al KIDs show promising performance.

Optimized for 10-m-class high-altitude telescopes.

Abstract

We present a multi-chroic kinetic inductance detector (KID) pixel design integrated with a broadband hierarchical phased-array antenna. Each low-frequency pixel consists of four high-frequency pixels. Four passbands are designed from 125 to 365 GHz according to the atmospheric windows. The lumped element KIDs consist of 100-nm thick AlMn inductors and Nb parallel plate capacitors with hydrogenated amorphous Si dielectric. Two different coupling structures are designed to couple millimeter-wave from microstrip lines to KIDs. The KID designs are optimized for a 10-m-class telescope at a high, dry site, for example, the Leighton Chajnantor Telescope. Preliminary measurement results using Al KIDs are discussed.