  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 (CMB) 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 two years.
