Demonstration of the broadband half-wave plate using the nine-layer sapphire for the CMB polarization experiment

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

Research output: Contribution to journalArticlepeer-review

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 degrees. 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.

Original languageEnglish
JournalJournal of Astronomical Telescopes, Instruments, and Systems
Volume5
Issue number4
Publication statusPublished - 2020

Keywords

  • Achromatic half-wave plate
  • B-mode
  • CMB polarization
  • Millimeter wave
  • Polarimetry
  • Space mission

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Control and Systems Engineering
  • Instrumentation
  • Astronomy and Astrophysics
  • Mechanical Engineering
  • Space and Planetary Science

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