Instrumentally induced spurious polarization of a multi-layer half wave plate for a CMB polarization observation

Hiroaki Imada, Tomotake Matsumura, Ryota Takaku, Guillaume Patanchon, Hirokazu Ishino, Yuki Sakurai, Kunimoto Komatsu, Nobuhiko Katayama

Research output: Contribution to conferencePaper

Abstract

Recent cosmic microwave background (CMB) polarization experiments employ a rotating half wave plate (HWP) as a polarization modulator. In order to cover a wide range of a radio frequency, a multi-layer HWP has been studied. In this paper, we set up a numerical model of a 9-layer HWP based on the design for LiteBIRD and estimated the optical properties. Sub-wavelength structure for anti-reflection was also modeled. We used a commercial software based on Rigorous Coupled-Wave Analysis. We have confirmed that spurious polarization by a HWP does not appear for a normal incidence. On the other hand, the spurious polarization can be observed for an oblique incidence. When the incident angle is 10 degrees the magnitude of the spurious polarization is about 10 -4 , which is comparable to the effect of the gravitational lensing B-mode. We have also confirmed that this design has the potential to achieve a highly efficient polarization modulator.

Original languageEnglish
Pages61-67
Number of pages7
Publication statusPublished - Jan 1 2018
Event29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018 - Pasadena, United States
Duration: Mar 26 2018Mar 28 2018

Conference

Conference29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018
CountryUnited States
CityPasadena
Period3/26/183/28/18

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Space and Planetary Science
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Radiation

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    Imada, H., Matsumura, T., Takaku, R., Patanchon, G., Ishino, H., Sakurai, Y., Komatsu, K., & Katayama, N. (2018). Instrumentally induced spurious polarization of a multi-layer half wave plate for a CMB polarization observation. 61-67. Paper presented at 29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018, Pasadena, United States.