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Proceedings Paper

Multichroic dual-polarization bolometric detectors for studies of the cosmic microwave background
Author(s): Aritoki Suzuki; Kam Arnold; Jennifer Edwards; Greg Engargiola; Adnan Ghribi; William Holzapfel; Adrian T. Lee; Xiao Fan Meng; Michael J. Myers; Roger O'Brient; Erin Quealy; Gabriel Rebeiz; Paul Richards; Darin Rosen; Praween Siritanasak
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Paper Abstract

We are developing multi-chroic antenna-coupled TES detectors for CMB polarimetry. Multi-chroic detectors in- crease the mapping speed per focal plane area and provide greater discrimination of polarized galactic foregrounds with no increase in weight or cryogenic cost. In each pixel, a silicon lens-coupled dual polarized sinuous antenna collects light over a two-octave frequency band. The antenna couples the broadband millimeter wave signal into microstrip transmission lines, and on-chip filter banks split the broadband signal into several frequency bands. Separate TES bolometers detect the power in each frequency band and linear polarization. We will describe the design and performance of these devices and present optical data taken with prototype pixels. Our measurements show beams with percent level ellipticity, percent level cross-polarization leakage, and partitioned bands using banks of 2, 3, and 7 filters. We will also describe the development of broadband anti-reflection coatings for the high dielectric constant lens. The broadband anti-reflection coating has approximately 100% bandwidth and no detectable loss at cryogenic temperature. Finally, we will describe an upgrade for the Polarbear CMB experiment and installation for the LiteBIRD CMB satellite experiment both of which have focal planes with kilo-pixel of these detectors to achieve unprecedented mapping speed.

Paper Details

Date Published: 5 October 2012
PDF: 10 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84523H (5 October 2012); doi: 10.1117/12.924869
Show Author Affiliations
Aritoki Suzuki, Univ. of California, Berkeley (United States)
Kam Arnold, Univ. of California, Berkeley (United States)
Jennifer Edwards, Univ. of California, San Diego (United States)
Greg Engargiola, Lawrence Berkeley National Lab. (United States)
Adnan Ghribi, Univ. of California, Berkeley (United States)
William Holzapfel, Univ. of California, Berkeley (United States)
Adrian T. Lee, Univ. of California, Berkeley (United States)
Xiao Fan Meng, Univ. of California, Berkeley (United States)
Michael J. Myers, Univ. of California, Berkeley (United States)
Roger O'Brient, California Institute of Technology (United States)
Erin Quealy, Univ. of California, Berkeley (United States)
Gabriel Rebeiz, Univ. of California, San Diego (United States)
Paul Richards, Univ. of California, Berkeley (United States)
Darin Rosen, Univ. of California, Berkeley (United States)
Praween Siritanasak, Univ. of California, San Diego (United States)


Published in SPIE Proceedings Vol. 8452:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Wayne S. Holland, Editor(s)

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