Clean Beam Patterns with Low Crosstalk Using 850 GHz Microwave Kinetic Inductance Detectors
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We present modeling of distributed \(\lambda \)/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 (\(\sim \)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.
KeywordsKinetic inductance detector KID MKID Low temperature detectors
Akira Endo is supported by NWO (Veni Grant 639.041.023) and JSPS (Fellowship for Research Abroad 215). This work was in part supported by ERC starting Grant ERC-2009-StG Grant 240602 TFPA. This work has been supported as part of a collaborative Project, SPACEKIDS, funded via Grant 313320 provided by the European Commission under Theme SPA.2012.2.2-01 of Framework Programme 7. The authors would like to thank Matt Griffin for his help in proof reading.
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