Austermann, J.
, Beall, J.
, Hubmayr, J.
, Koc, M.
, Ullom, J.
, Van Lanen, J.
, Vissers, M.
and Wheeler, J.
(2026),
CCAT: Silicon-Platelet Feedhorns for Submillimeter Wavelengths, IEEE Transactions on Applied Superconductivity ( Volume: 36, Issue: 6, September 2026) , Sante Fe, NM, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=960926 (Accessed August 12, 2026)
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CCAT: Silicon-Platelet Feedhorns for Submillimeter Wavelengths
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Abstract
Silicon-platelet feedhorn arrays are an established technology at millimeter wavelengths that, for some applications, can provide significant advantages over traditional direct-machined metal feedhorns. The Prime-Cam focal planes operating in the 350 GHz (∼860 µm) and 850 GHz (∼350 µm) bands are anticipated to carry the first silicon-platelet feedhorn arrays to operate fully at submillimeter wavelengths, representing a significant step forward in the application of this technology. In particular, the feedhorns designed for operation in the 850 GHz band represent a 3x increase in frequency compared to previously demonstrated and deployed devices of this type. Here we present a demonstration of silicon-platelet feedhorns at these submillimeter wavelengths, including in-lab performance characterization. We present fabrication metrology, room-temperature beam maps, and cryogenic optical efficiency measurements where the feedhorns are coupled to prototype CCAT Prime-Cam detectors. We show that feedhorn performance measurements are well matched to simulation and compare that performance directly to traditional, direct-machined metal feedhorns.Proceedings Title
IEEE Transactions on Applied Superconductivity ( Volume: 36, Issue: 6, September 2026)
Volume
36
Issue
6
Conference Dates
June 1-6, 2025
Conference Location
Sante Fe, NM, US
Pub Type
Conferences
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Keywords
feedhorns, silicon micromachining, coupling op- tics, submillimeter, millimeter
Citation
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Created May 4, 2026, Updated August 11, 2026