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Proceedings Paper

Silicon-based antenna-coupled polarization-sensitive millimeter-wave bolometer arrays for cosmic microwave background instruments
Author(s): Karwan Rostem; Aamir Ali; John W. Appel; Charles L. Bennett; Ari Brown; Meng-Ping Chang; David T. Chuss; Felipe A. Colazo; Nick Costen; Kevin L. Denis; Tom Essinger-Hileman; Ron Hu; Tobias A. Marriage; Samuel H. Moseley; Thomas R. Stevenson; Kongpop U-Yen; Edward J. Wollack; Zhilei Xu
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Paper Abstract

We describe feedhorn-coupled polarization-sensitive detector arrays that utilize monocrystalline silicon as the dielectric substrate material. Monocrystalline silicon has a low-loss tangent and repeatable dielectric constant, characteristics that are critical for realizing efficient and uniform superconducting microwave circuits. An additional advantage of this material is its low specific heat. In a detector pixel, two Transition-Edge Sensor (TES) bolometers are antenna-coupled to in-band radiation via a symmetric planar orthomode transducer (OMT). Each orthogonal linear polarization is coupled to a separate superconducting microstrip transmission line circuit. On-chip filtering is employed to both reject out-of-band radiation from the upper band edge to the gap frequency of the niobium superconductor, and to flexibly define the bandwidth for each TES to meet the requirements of the application. The microwave circuit is compatible with multi-chroic operation. Metalized silicon platelets are used to define the backshort for the waveguide probes. This micro-machined structure is also used to mitigate the coupling of out-of-band radiation to the microwave circuit. At 40 GHz, the detectors have a measured efficiency of ∼90%. In this paper, we describe the development of the 90 GHz detector arrays that will be demonstrated using the Cosmology Large Angular Scale Surveyor (CLASS) ground-based telescope.

Paper Details

Date Published: 27 July 2016
PDF: 10 pages
Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99140D (27 July 2016); doi: 10.1117/12.2234308
Show Author Affiliations
Karwan Rostem, Johns Hopkins Univ. (United States)
NASA Goddard Space Flight Ctr. (United States)
Aamir Ali, Johns Hopkins Univ. (United States)
John W. Appel, Johns Hopkins Univ. (United States)
Charles L. Bennett, Johns Hopkins Univ. (United States)
Ari Brown, NASA Goddard Space Flight Ctr. (United States)
Meng-Ping Chang, SGT Stinger Ghaffarian Technologies (United States)
David T. Chuss, Villanova Univ. (United States)
Felipe A. Colazo, NASA Goddard Space Flight Ctr. (United States)
Nick Costen, SGT Stinger Ghaffarian Technologies (United States)
Kevin L. Denis, NASA Goddard Space Flight Ctr. (United States)
Tom Essinger-Hileman, Johns Hopkins Univ. (United States)
Ron Hu, SGT Stinger Ghaffarian Technologies (United States)
Tobias A. Marriage, Johns Hopkins Univ. (United States)
Samuel H. Moseley, NASA Goddard Space Flight Ctr. (United States)
Thomas R. Stevenson, NASA Goddard Space Flight Ctr. (United States)
Kongpop U-Yen, NASA Goddard Space Flight Ctr. (United States)
Edward J. Wollack, NASA Goddard Space Flight Ctr. (United States)
Zhilei Xu, Johns Hopkins Univ. (United States)


Published in SPIE Proceedings Vol. 9914:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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