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Multi-chroic Dual-Polarization Bolometric Focal Plane for Studies of the Cosmic Microwave Background

Suzuki, A. and Arnold, K. and Edwards, J. and Engargiola, G. and Ghribi, A. and Holzapfel, W. and Lee, A. and Meng, X. and Myers, M. and O'Brient, R. and Quealy, E. and Rebeiz, G. and Richards, P. (2012) Multi-chroic Dual-Polarization Bolometric Focal Plane for Studies of the Cosmic Microwave Background. Journal of Low Temperature Physics, 167 (5-6). pp. 852-858. ISSN 0022-2291.

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We are developing multi-chroic antenna-coupled Transition Edge Sensor (TES) focal planes for Cosmic Microwave Background (CMB) polarimetry. In each pixel, a dual polarized sinuous antenna collects light over a two-octave frequency band. Each antenna couples to the telescope with a contacting silicon lens. The antenna couples the broadband RF signal to microstrip transmission lines, and then filter banks split the broadband signal into several frequency bands. A TES bolometer detects the power in each band and polarization. We will describe the design of this device and demonstrate its performance with optical data measured using prototype pixels. Our measurements show low ellipticity beams, low cross-polarization, and properly partitioned bands in banks of 2, 3, and 7 filters. Finally, we will describe how we will upgrade the POLARBEAR CMB experiment using the focal planes of these detectors to increase the experiment’s mapping speed and its ability to discriminate between the CMB and polarized foregrounds.

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Additional Information:© 2012 Springer Science+Business Media, LLC. Received: 1 August 2011; Accepted: 10 February 2012; Published online: 7 March 2012. We acknowledge support from the NASA, NASA grant NNX10AC67G. We fabricated our device at the Marvell Nanofabrication Laboratory at the University of California, Berkeley.
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Subject Keywords:CMB; Polarization; B-Mode; Foreground removal; Broadband; TES bolometer; Sinuous antenna; Microstrip filter; Multichroic
Issue or Number:5-6
Record Number:CaltechAUTHORS:20120605-104627747
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31811
Deposited By: Jason Perez
Deposited On:05 Jun 2012 20:29
Last Modified:03 Oct 2019 03:55

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