Construction of a large diameter reflective half-wave plate modulator for millimeter wave applications

Joseph R. Eimer; Michael K. Brewer; David T. Chuss; John Karakla; Rui Shi; John W. Appel; Charles L. Bennett; Joseph Cleary; Sumit Dahal; Rahul Datta; Thomas Essinger-Hileman; Tobias A. Marriage; Carolina Núñez; Matthew A. Petroff; Duncan J. Watts; Edward J. Wollack; Zhilei Xu

doi:10.1117/12.2630637

31 August 2022 Construction of a large diameter reflective half-wave plate modulator for millimeter wave applications

Joseph R. Eimer, Michael K. Brewer, David T. Chuss, John Karakla, Rui Shi, John W. Appel, Charles L. Bennett, Joseph Cleary, Sumit Dahal, Rahul Datta, Thomas Essinger-Hileman, Tobias A. Marriage, Carolina Núñez, Matthew A. Petroff, Duncan J. Watts, Edward J. Wollack, Zhilei Xu

Author Affiliations +

Proceedings Volume 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; 121901N (2022) https://doi.org/10.1117/12.2630637
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Polarization modulation is a powerful technique to increase the stability of measurements by enabling the distinction of a polarized signal from dominant slow system drifts and unpolarized foregrounds. Furthermore, when placed as close to the sky as possible, modulation can reduce systematic errors from instrument polarization. In this work, we introduce the design and preliminary drive system laboratory performance of a new 60 cm diameter reflective half-wave plate (RHWP) polarization modulator. The wave plate consists of a wire array situated in front of a flat mirror. Using 50 μm diameter wires with 175 μm spacing, the wave plate will be suitable for operation in the millimeter wavelength range with flatness of the wires and parallelism to the mirror held to a small fraction of a wavelength. The presented design targets the 77–108 GHz range. Modulation is performed by a rotation of the wave plate with a custom rotary drive utilizing an actively controlled servo motor.

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Joseph R. Eimer, Michael K. Brewer, David T. Chuss, John Karakla, Rui Shi, John W. Appel, Charles L. Bennett, Joseph Cleary, Sumit Dahal, Rahul Datta, Thomas Essinger-Hileman, Tobias A. Marriage, Carolina Núñez, Matthew A. Petroff, Duncan J. Watts, Edward J. Wollack, and Zhilei Xu "Construction of a large diameter reflective half-wave plate modulator for millimeter wave applications", Proc. SPIE 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, 121901N (31 August 2022); https://doi.org/10.1117/12.2630637

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