CCAT: Silicon-Platelet Feedhorns for Submillimeter Wavelengths
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910160914481152 |
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| author | Austermann, Jason Beall, James Burgoyne, James R. Chapman, Scott Choi, Steve Duell, Cody J. Huber, Anthony I. Hubmayr, Johannes Koc, Matthew A. Niemack, Michael D. Ullom, Joel N. van Lanen, Jeffrey Vaskuri, Anna Vissers, Michael Wheeler, Jordan |
| author_facet | Austermann, Jason Beall, James Burgoyne, James R. Chapman, Scott Choi, Steve Duell, Cody J. Huber, Anthony I. Hubmayr, Johannes Koc, Matthew A. Niemack, Michael D. Ullom, Joel N. van Lanen, Jeffrey Vaskuri, Anna Vissers, Michael Wheeler, Jordan |
| contents | 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 ($\sim$860 $\mathrmμ$m) and 850 GHz ($\sim$350 $\mathrmμ$m) 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 beammaps, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_22075 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | CCAT: Silicon-Platelet Feedhorns for Submillimeter Wavelengths Austermann, Jason Beall, James Burgoyne, James R. Chapman, Scott Choi, Steve Duell, Cody J. Huber, Anthony I. Hubmayr, Johannes Koc, Matthew A. Niemack, Michael D. Ullom, Joel N. van Lanen, Jeffrey Vaskuri, Anna Vissers, Michael Wheeler, Jordan Instrumentation and Methods for Astrophysics 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 ($\sim$860 $\mathrmμ$m) and 850 GHz ($\sim$350 $\mathrmμ$m) 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 beammaps, 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. |
| title | CCAT: Silicon-Platelet Feedhorns for Submillimeter Wavelengths |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2604.22075 |