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Proceedings Paper

Measurements and analysis of optical crosstalk in a microwave kinetic inductance detector array
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Paper Abstract

The main advantage of Microwave Kinetic Inductance Detector arrays (MKID) is their multiplexing capability, which allows for building cameras with a large number of pixels and good sensitivity, particularly suitable to perform large blank galaxy surveys. However, to have as many pixels as possible it is necessary to arrange detectors close in readout frequency. Consequently KIDs overlap in frequency and are coupled to each other producing crosstalk. Because crosstalk can be only minimised by improving the array design, in this work we aim to correct for this effect a posteriori. We analysed a MKID array consisting of 880 KIDs with readout frequencies at 4-8 GHz. We measured the beam patterns for every detector in the array and described the response of each detector by using a two-dimensional Gaussian fit. Then, we identified detectors affected by crosstalk above -30 dB level from the maximum and removed the signal of the crosstalking detectors. Moreover, we modelled the crosstalk level for each KID as a function of the readout frequency separation starting from the assumption that the transmission of a KID is a Lorenztian function in power. We were able to describe the general crosstalk level of the array and the crosstalk of each KID within 5 dB, so enabling the design of future arrays with the crosstalk as a design criterion. In this work, we demonstrate that it is possible to process MKID images a posteriori to decrease the crosstalk effect, subtracting the response of each coupled KID from the original map.

Paper Details

Date Published: 20 July 2016
PDF: 8 pages
Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99143L (20 July 2016); doi: 10.1117/12.2238643
Show Author Affiliations
L. Bisigello, Univ. of Groningen (Netherlands)
SRON Netherlands Institute for Space Research (Netherlands)
S. J. C. Yates, SRON Netherlands Institute for Space Research (Netherlands)
L. Ferrari, SRON Netherlands Institute for Space Research (Netherlands)
J. J. A. Baselmans, SRON Netherlands Institute for Space Research (Netherlands)
A. Baryshev, Univ. of Groningen (Netherlands)
SRON Netherlands Institute for Space Research (Netherlands)


Published in SPIE Proceedings Vol. 9914:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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