An all silicon feedhorn-coupled focal plane for cosmic microwave background polarimetry

J. Hubmayr, J. W. Appel, J. E. Austermann, J. A. Beall, D. Becker, B. A. Benson, L. E. Bleem, J. E. Carlstrom, C. L. Chang, H. M. Cho, A. T. Crites, T. Essinger-Hileman, A. Fox, E. M. George, N. W. Halverson, N. L. Harrington, J. W. Henning, G. C. Hilton, W. L. Holzapfel, K. D. IrwinA. T. Lee, D. Li, J. McMahon, J. Mehl, T. Natoli, M. D. Niemack, L. B. Newburgh, J. P. Nibarger, L. P. Parker, B. L. Schmitt, S. T. Staggs, J. Van Lanen, E. J. Wollack, K. W. Yoon

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Upcoming experiments aim to produce high fidelity polarization maps of the cosmic microwave background. To achieve the required sensitivity, we are developing monolithic, feedhorn-coupled transition edge sensor polarimeter arrays operating at 150 GHz. We describe this focal plane architecture and the current status of this technology, focusing on single-pixel polarimeters being deployed on the Atacama B-mode Search (ABS) and an 84-pixel demonstration feedhorn array backed by four 10-pixel polarimeter arrays. The feedhorn array exhibits symmetric beams, cross-polar response <-23 dB and excellent uniformity across the array. Monolithic polarimeter arrays, including arrays of silicon feedhorns, will be used in the Atacama Cosmology Telescope Polarimeter (ACTPol) and the South Pole Telescope Polarimeter (SPTpol) and have been proposed for upcoming balloon-borne instruments.

Original languageEnglish (US)
Pages (from-to)904-910
Number of pages7
JournalJournal of Low Temperature Physics
Issue number5-6
StatePublished - Jun 2012

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


  • Cosmic microwave background
  • Polarimeter
  • Transition edge sensor


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