15 July 2010 Corrugated silicon platelet feed horn array for CMB polarimetry at 150 GHz
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Abstract
Next generation cosmic microwave background (CMB) polarization anisotropy measurements will feature focal plane arrays with more than 600 millimeter-wave detectors. We make use of high-resolution photolithography and wafer-scale etch tools to build planar arrays of corrugated platelet feeds in silicon with highly symmetric beams, low cross-polarization and low side lobes. A compact Au-plated corrugated Si feed designed for 150 GHz operation exhibited performance equivalent to that of electroformed feeds: ~ -0.2 dB insertion loss, < -20 dB return loss from 120 GHz to 170 GHz, < -25 dB side lobes and < -23 dB cross-polarization. We are currently fabricating a 50mm diameter array with 84 horns consisting of 33 Si platelets as a prototype for the SPTpol and ACTpol telescopes. Our fabrication facilities permit arrays up to 150mm in diameter.
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Joe W. Britton, Joe W. Britton, John P. Nibarger, John P. Nibarger, Ki Won Yoon, Ki Won Yoon, James A. Beall, James A. Beall, Dan Becker, Dan Becker, Hsiao-Mei Cho, Hsiao-Mei Cho, Gene C. Hilton, Gene C. Hilton, Johannes Hubmayr, Johannes Hubmayr, Michael D. Niemack, Michael D. Niemack, Kent D. Irwin, Kent D. Irwin, } "Corrugated silicon platelet feed horn array for CMB polarimetry at 150 GHz", Proc. SPIE 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, 77410T (15 July 2010); doi: 10.1117/12.857701; https://doi.org/10.1117/12.857701
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