Clean Beam Patterns with Low Crosstalk Using 850 GHz Microwave Kinetic Inductance Detectors

We present modeling of distributed λ /4 microwave kinetic inductance detectors (MKIDs) showing how electromagnetic cross coupling between the MKID resonators can occur at frequencies corresponding to the microwave readout signal ( ∼ 4–8 GHz). We then show system beam pattern measurements in the reim...

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Bibliographic Details
Published in:Journal of low temperature physics 2014-09, Vol.176 (5-6), p.761-766
Main Authors: Yates, S. J. C., Baselmans, J. J. A., Baryshev, A. M., Doyle, S., Endo, A., Ferrari, L., Hochgürtel, S., Klein, B.
Format: Article
Language:English
Subjects:
Beams (radiation)
Characterization and Evaluation of Materials
Condensed Matter Physics
Cross coupling
Crosstalk
Detectors
Focal plane
Inductance
Magnetic Materials
Magnetism
Microwaves
Noise levels
Physics
Physics and Astronomy
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Summary:We present modeling of distributed λ /4 microwave kinetic inductance detectors (MKIDs) showing how electromagnetic cross coupling between the MKID resonators can occur at frequencies corresponding to the microwave readout signal ( ∼ 4–8 GHz). We then show system beam pattern measurements in the reimaged focal plane of a 72 detector array of lens–antenna coupled MKIDs at 850 GHz, which enables a direct measure of any residual optical crosstalk. With use of transmission line bridges we see no residual cross coupling between MKIDs and hence low crosstalk down to the - 30 dB level, with near Gaussian shape (limited by reimaging optics) to - 10 dB level.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-013-1034-z