arXiv 1007.08052010-07-06astro-ph.IMastro-ph.CO

Corrugated Silicon Platelet Feed Horn Array for CMB Polarimetry at 150 GHz

Joseph W. Britton, John P. Nibarger, Ki Won Yoon, James A. Beall, Dan Becker, Hsiao-Mei Cho, Gene C. Hilton, Johannes Hubmayr, Michael D. Niemack, Kent D. Irwin

备注：: 12 pages; SPIE proceedings for Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V (Conference 7741, June 2010, San Diego, CA, USA)
DOI：: 10.1117/12.857885

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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 50 mm 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 150 mm in diameter.

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