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

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 conference › Paper › peer-review

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 language	English
Pages	61-67
Number of pages	7
Publication status	Published - 2018
Event	29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018 - Pasadena, United States Duration: Mar 26 2018 → Mar 28 2018

Conference

Conference	29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018
Country	United States
City	Pasadena
Period	3/26/18 → 3/28/18

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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Instrumentally induced spurious polarization of a multi-layer half wave plate for a CMB polarization observation. / Imada, Hiroaki; Matsumura, Tomotake; Takaku, Ryota; Patanchon, Guillaume; Ishino, Hirokazu; Sakurai, Yuki; Komatsu, Kunimoto; Katayama, Nobuhiko.

2018. 61-67 Paper presented at 29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018, Pasadena, United States.

Research output: Contribution to conference › Paper › peer-review

Imada, Hiroaki ; Matsumura, Tomotake ; Takaku, Ryota ; Patanchon, Guillaume ; Ishino, Hirokazu ; Sakurai, Yuki ; Komatsu, Kunimoto ; Katayama, Nobuhiko. / Instrumentally induced spurious polarization of a multi-layer half wave plate for a CMB polarization observation. Paper presented at 29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018, Pasadena, United States.7 p.

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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.",

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

note = "Funding Information: ACKNOWLEDGMENT This work was supported by JSPS KAKENHI Grant Number 15H05891 and 15H05441.; 29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018 ; Conference date: 26-03-2018 Through 28-03-2018",

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T1 - Instrumentally induced spurious polarization of a multi-layer half wave plate for a CMB polarization observation

AU - Imada, Hiroaki

AU - Matsumura, Tomotake

AU - Takaku, Ryota

AU - Patanchon, Guillaume

AU - Ishino, Hirokazu

AU - Sakurai, Yuki

AU - Komatsu, Kunimoto

AU - Katayama, Nobuhiko

N1 - Funding Information: ACKNOWLEDGMENT This work was supported by JSPS KAKENHI Grant Number 15H05891 and 15H05441.

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

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