A study on the performance of half-wave plates designed for sub-mm studies

Charlotte Braithwaite; Carole Tucker; Erminia Calabrese; Giulio Fabbian; Serena Giardiello; Giampaolo Pisano; Giorgio Savini

doi:10.1117/12.3019262

19 July 2024 A study on the performance of half-wave plates designed for sub-mm studies

Charlotte Braithwaite, Carole Tucker, Erminia Calabrese, Giulio Fabbian, Serena Giardiello, Giampaolo Pisano, Giorgio Savini

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 1309676 (2024) https://doi.org/10.1117/12.3019262
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

A number of millimetre (mm) and sub-millimetre (sub-mm) instruments use half wave plates (HWP) as polarisation modulators, but a thorough account of the non-idealities arising in the HWP is crucial for the analysis of systematic errors. For Cosmic Microwave Background (CMB) experiments, studies propagating the measured spectral performance of a HWP through to scientific results, such as the tensor-to-scalar ratio, r, have not been conducted. Presented in this work is the measured spectral performance of an embedded metal mesh HWP designed for the NIKA2 experiment. The results were propagated through to calculate the bias on r introduced from it's non-idealities and a comparison between metal mesh and Pancharatnam type HWPs is conducted.

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Charlotte Braithwaite, Carole Tucker, Erminia Calabrese, Giulio Fabbian, Serena Giardiello, Giampaolo Pisano, and Giorgio Savini "A study on the performance of half-wave plates designed for sub-mm studies", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 1309676 (19 July 2024); https://doi.org/10.1117/12.3019262

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