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Dual-polarization sensitive MKIDs for far infrared astrophysics



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


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
IEEE Transactions on Applied Superconductivity


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], (Accessed June 16, 2024)


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Created December 12, 2012, Updated November 10, 2018