Demonstration of the broadband half-wave plate using the nine-layer sapphire for the cosmic microwave background polarization experiment

Kunimoto Komatsu; Tomotake Matsumura; Hiroaki Imada; Hirokazu Ishino; Nobuhiko Katayama; Yuki Sakurai

doi:10.1117/1.JATIS.5.4.044008

20 November 2019 Demonstration of the broadband half-wave plate using the nine-layer sapphire for the cosmic microwave background polarization experiment

Kunimoto Komatsu, Tomotake Matsumura, Hiroaki Imada, Hirokazu Ishino, Nobuhiko Katayama, Yuki Sakurai

Author Affiliations +

Funded by: Japan Society for the Promotion of Science (JSPS), Core-to-Core Program, A. Advanced Research Networks, Ministry of Education, Culture, Sports, Science and Technology

Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 5, Issue 4, 044008 (November 2019). https://doi.org/10.1117/1.JATIS.5.4.044008

Abstract

We report the development of the achromatic half-wave plate (AHWP) at millimeter wave for cosmic microwave background polarization experiments. We fabricate an AHWP consisting of nine A-cut sapphire plates based on the Pancharatnam recipe to cover a wide frequency range. The modulation efficiency and the phase are measured in a frequency range of 33 to 260 GHz with incident angles up to 10 deg. We find the measurements at room temperature are in good agreement with the predictions. This is the most broadband demonstration of an AHWP at millimeter wave.

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Kunimoto Komatsu, Tomotake Matsumura, Hiroaki Imada, Hirokazu Ishino, Nobuhiko Katayama, and Yuki Sakurai "Demonstration of the broadband half-wave plate using the nine-layer sapphire for the cosmic microwave background polarization experiment," Journal of Astronomical Telescopes, Instruments, and Systems 5(4), 044008 (20 November 2019). https://doi.org/10.1117/1.JATIS.5.4.044008

Received: 24 April 2019; Accepted: 29 October 2019; Published: 20 November 2019

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