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 |
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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 |
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Country/Territory | 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