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13 December 2020 Multiplexable frequency retuning of MKID arrays using their non-linear kinetic inductance
M. De Lucia, E. Baldwin, G. Ulbricht, C. Bracken, P. Stamenov, T. P. Ray
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Proceedings Volume 11454, X-Ray, Optical, and Infrared Detectors for Astronomy IX; 114542Z (2020) https://doi.org/10.1117/12.2560384
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only
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Abstract
Microwave Kinetic Inductance Detector (MKID) arrays are currently being developed and deployed for astronomical applications in the visible and near infrared and for sub-millimetre astronomy. One of the main challenges of MKIDs is that large arrays would exhibit a pixel yield, defined as the percentage of individually distinguishable pixels to the total number of pixels, of 75 80 %.1 Imperfections arising during the fabrication can induce an uncontrolled shift in the resonance frequency of individual resonators which end up resonating at the same frequency of a different resonator. This makes a number of pixels indistinguishable and therefore unusable for imaging. This paper proposes an approach to individually re-tune the colliding resonators in order to remove the degeneracy and increase the number of MKIDs with unique resonant frequencies. The frequency re-tuning is achieved through a DC bias of the resonator since the kinetic inductance of a superconducting thin film is current dependent and its dependence is non linear. Even though this approach has been already proposed,2 our innovative pixel design may solve two issues previously described in literature such as non-negligible electromagnetic losses to the DC bias line, and the multiplexibility of multiple resonators on a single feed-line.
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M. De Lucia, E. Baldwin, G. Ulbricht, C. Bracken, P. Stamenov, and T. P. Ray "Multiplexable frequency retuning of MKID arrays using their non-linear kinetic inductance", Proc. SPIE 11454, X-Ray, Optical, and Infrared Detectors for Astronomy IX, 114542Z (13 December 2020); https://doi.org/10.1117/12.2560384
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KEYWORDS
Inductance
Resonators
Detector arrays
Lithography
Microwave radiation
Sensors
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