Advanced ACTPol Multichroic Polarimeter Array Fabrication Process for 150 mm Wafers

S. M. Duff, J. Austermann, J. A. Beall, D. Becker, R. Datta, P. A. Gallardo, S. W. Henderson, G. C. Hilton, S. P. Ho, J. Hubmayr, B. J. Koopman, D. Li, J. McMahon, F. Nati, M. D. Niemack, C. G. Pappas, M. Salatino, B. L. Schmitt, S. M. Simon, S. T. StaggsJ. R. Stevens, J. Van Lanen, E. M. Vavagiakis, J. T. Ward, E. J. Wollack

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39 Scopus citations


Advanced ACTPol (AdvACT) is a third-generation cosmic microwave background receiver to be deployed in 2016 on the Atacama Cosmology Telescope (ACT). Spanning five frequency bands from 25 to 280 GHz and having just over 5600 transition-edge sensor (TES) bolometers, this receiver will exhibit increased sensitivity and mapping speed compared to previously fielded ACT instruments. This paper presents the fabrication processes developed by NIST to scale to large arrays of feedhorn-coupled multichroic AlMn-based TES polarimeters on 150-mm diameter wafers. In addition to describing the streamlined fabrication process which enables high yields of densely packed detectors across larger wafers, we report the details of process improvements for sensor (AlMn) and insulator (SiNx) materials and microwave structures, and the resulting performance improvements.

Original languageEnglish (US)
Pages (from-to)634-641
Number of pages8
JournalJournal of Low Temperature Physics
Issue number3-4
StatePublished - Aug 1 2016

All Science Journal Classification (ASJC) codes

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


  • AlMn
  • Multichroic
  • Polarimeter
  • SiN
  • Transition-edge sensor


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