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 October 9, 2025)
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Dual-polarization sensitive MKIDs for far infrared astrophysics
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Author(s)
, , , , Brad Dober, Mark Devlin, , , , , , ,
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 isCitation
IEEE Transactions on Applied Superconductivity
Volume
23
Issue
3
Pub Type
Journals
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Created December 12, 2012, Updated November 10, 2018