Development of Multi-chroic MKIDs for Next-Generation CMB Polarization Studies

B. R. Johnson, D. Flanigan, M. H. Abitbol, P. A.R. Ade, S. Bryan, H. M. Cho, R. Datta, P. Day, S. Doyle, K. Irwin, G. Jones, D. Li, Philip Mauskopf, H. McCarrick, J. McMahon, A. Miller, G. Pisano, Y. Song, H. Surdi, C. Tucker

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)103-112
Number of pages10
JournalJournal of Low Temperature Physics
Issue number3-4
StatePublished - Nov 1 2018


  • CMB
  • MKIDs
  • Multi-chroic
  • Polarization

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics


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