We report on the status of an ongoing effort to develop arrays of horn-coupled, polarization-sensitive microwave kinetic inductance detectors (MKIDs) that are each sensitive to two spectral bands between 125 and 280 GHz. These multi-chroic MKID arrays are tailored for next-generation, large-detector-count experiments that are being designed to simultaneously characterize the polarization properties of both the cosmic microwave background and Galactic dust emission. We present our device design and describe laboratory-based measurement results from two 23-element prototype arrays. From dark measurements of our first engineering array, we demonstrated a multiplexing factor of 92, showed the resonators respond to bath temperature changes as expected, and found that the fabrication yield was 100%. From our first optically loaded array, we found the MKIDs respond to millimeter-wave pulses; additional optical characterization measurements are ongoing. We end by discussing our plans for scaling up this technology to kilo-pixel arrays over the next 2 years.
CITATION STYLE
Johnson, B. R., Flanigan, D., Abitbol, M. H., Ade, P. A. R., Bryan, S., Cho, H. M., … Tucker, C. (2018). Development of Multi-chroic MKIDs for Next-Generation CMB Polarization Studies. Journal of Low Temperature Physics, 193(3–4), 103–112. https://doi.org/10.1007/s10909-018-2032-y
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