Polarization rotation through differential transmission in refractive CMB telescopes identified using a hybrid physical optics method
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866912807821246464 |
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| author | Ren, Xiaodong Balafendiev, Rustam Gudmundsson, Jon E. |
| author_facet | Ren, Xiaodong Balafendiev, Rustam Gudmundsson, Jon E. |
| contents | We identify a polarization rotation systematic in the far field beams of refractive cosmic microwave background (CMB) telescopes caused by differential transmission in anti-reflection (AR) coatings of optical elements. This systematic was identified following the development of a hybrid physical optics method that incorporates full-wave electromagnetic simulations of AR coatings to model the full polarization response of refractive systems. Applying this method to a two-lens CMB telescope with non-ideal AR coating, we show that polarization-dependent transmission can produce a rotation of the far-field polarization angle that varies across the focal plane with a typical amplitude of 0.05-0.5 degrees. If ignored in analysis, this effect can produce temperature to polarization leakage and Stokes Q/U mixing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_03925 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Polarization rotation through differential transmission in refractive CMB telescopes identified using a hybrid physical optics method Ren, Xiaodong Balafendiev, Rustam Gudmundsson, Jon E. Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics Optics We identify a polarization rotation systematic in the far field beams of refractive cosmic microwave background (CMB) telescopes caused by differential transmission in anti-reflection (AR) coatings of optical elements. This systematic was identified following the development of a hybrid physical optics method that incorporates full-wave electromagnetic simulations of AR coatings to model the full polarization response of refractive systems. Applying this method to a two-lens CMB telescope with non-ideal AR coating, we show that polarization-dependent transmission can produce a rotation of the far-field polarization angle that varies across the focal plane with a typical amplitude of 0.05-0.5 degrees. If ignored in analysis, this effect can produce temperature to polarization leakage and Stokes Q/U mixing. |
| title | Polarization rotation through differential transmission in refractive CMB telescopes identified using a hybrid physical optics method |
| topic | Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics Optics |
| url | https://arxiv.org/abs/2601.03925 |