Next-generation feedhorn-coupled kinetic inductance detector arrays

NASA missions in the millimeter, sub-millimeter, and far-infrared part of the electro-magnetic spectrum universally call for larger arrays of low-noise detectors. The microwave kinetic inductance detector is an important low-temperature-detector technology in these applications, and particularly for deployment in space. Dense, highly-multiplexed arrays with few interconnects and low-power consuming electronics lead to lower-cost, more robust satellite missions. We propose to significantly advance the technical maturity of feedhorn-coupled microwave kinetic inductance detectors (FC-KIDs), by tackling the key challenges that have historically limited MKID performance. These challenges include achieving photon-noise-limited sensitivity at detection frequencies below 1 Hz, maintaining high-quality MKIDs when integrated in more complex superconducting integrated circuits, and attaining high yield by avoiding resonator frequency collisions. We propose innovative solutions to overcome each challenge. We will develop 1) ultra-stable (to 1 mHz), low-noise arrays with aluminum sensors; 2) silicon parallel-plate capacitors with reduced size, loss, and TLS noise; 3) multichroic, dual-polarization-sensitive MKIDs scalable from 100-1000~GHz; and 4) highly uniform, >90% yield direct-absorber coupled MKID arrays fabricated on 150 mm substrates. Each of these research directives is backed-up by solid proof-of-principle demonstrations and concrete development plans. Relevant satellite missions for this technology include Origins Space Telescope, Inflation Probe, and Galaxy Evolution Probe.

The Astrophysics Research and Analysis program (APRA) supports suborbital and suborbital-class investigations, development of detectors and supporting technology, laboratory astrophysics, and limited ground based observing. Basic research proposals in these areas are solicited for investigations that are relevant to NASA's programs in astronomy and astrophysics, including the entire range of photons, gravitational waves, and particle astrophysics. The emphasis of this solicitation is on technologies and investigations that advance NASA astrophysics missions and goals.

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