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Aerogel scattering filters for cosmic microwave background observations
Author(s): Thomas Essinger-Hileman; Charles L. Bennett; Lance Corbett; Haiquan Guo; Tobias Marriage; Mary Ann B. Meador; Karwan Rostem; Edward J. Wollack
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Paper Abstract

We present the design and performance of broadband and tunable infrared-blocking filters for millimeter and sub-millimeter astronomy composed of small scattering particles embedded in an aerogel substrate. The ultralow-density (< 100 mg/cm3) aerogel substrate provides an index of refraction as low as 1.05, removing the need for anti-reflection coatings and allowing for broadband operation from DC to above 1 THz. The size distribution of the scattering particles can be tuned to provide a variable cutoff frequency. Aerogel filters with embedded high-resistivity silicon powder are being produced at 40-cm diameter to enable large-aperture cryogenic receivers for cosmic microwave background polarimeters, which require large arrays of sub-Kelvin detectors in their search for the signature of an inflationary gravitational-wave background.

Paper Details

Date Published: 9 July 2018
PDF: 9 pages
Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 107080F (9 July 2018); doi: 10.1117/12.2313387
Show Author Affiliations
Thomas Essinger-Hileman, NASA Goddard Space Flight Ctr. (United States)
Charles L. Bennett, Johns Hopkins Univ. (United States)
Lance Corbett, Johns Hopkins Univ. (United States)
Haiquan Guo, Ohio Aerospace Institute (United States)
Tobias Marriage, Johns Hopkins Univ. (United States)
Mary Ann B. Meador, NASA Glenn Research Ctr. (United States)
Karwan Rostem, NASA Goddard Space Flight Ctr. (United States)
Edward J. Wollack, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 10708:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX
Jonas Zmuidzinas; Jian-Rong Gao, Editor(s)

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