Dual-polarization sensitive MKIDs for far infrared astrophysics

Published

December 12, 2012

Author(s)

Johannes Hubmayr, James A. Beall, Daniel T. Becker, Hsiao-Mei Cho, Brad Dober, Mark Devlin, Anna E. Fox, Dale Li, Michael D. Niemack, David P. Pappas, Leila R. Vale, Kent D. Irwin, Gene C. Hilton

Abstract

We present the design for arrays of dual-polarization sensitive, superconducting sensors for far infrared astrophysics. Each pixel is feedhorn-coupled and consists of orthogonal, lumped-element kinetic inductance detectors (LEKIDs) both fabricated in the same deposition layer. Each LEKID pair contains an absorptive "one-turn" inductor and a large interdigitated capacitor (IDC) made of stoichiometric titanium nitride (TiN) with Tc ~ 4.5 K. Crossovers between the two inductors are bridged with short sections of niobium. This design enables dual-polarization sensitivity at frequencies above the superconducting gap of niobium (>; 700 GHz). Simulations of the optical coupling show 83% co-polar and {less than or equal to} 0.3% cross-polar coupling averaged over a 400 GHz band centered on 1.2 THz. The intrapixel resonator cross-talk is

Citation

IEEE Transactions on Applied Superconductivity

Volume

23

Issue

3

Pub Type

Journals

Download Paper

https://doi.org/10.1109/TASC.2012.2233857

Citation

Hubmayr, J. , Beall, J. , Becker, D. , Cho, H. , Dober, B. , Devlin, M. , Fox, A. , Li, D. , Niemack, M. , Pappas, D. , Vale, L. , Irwin, K. and Hilton, G. (2012), Dual-polarization sensitive MKIDs for far infrared astrophysics, IEEE Transactions on Applied Superconductivity, [online], https://doi.org/10.1109/TASC.2012.2233857 (Accessed April 25, 2024)