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Proceedings Paper

Dielectrically embedded mesh half wave plate beam impact studies
Author(s): B. Maffei; G. Pisano; M. W. Ng; V. C. Haynes
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Paper Abstract

An alternative solution to classic birefringent Half Wave Plates (HWP), based on the photolithographic techniques, has been recently developed. This new device can offer a very good alternative as a polarisation modulator for future CMB polarisation instruments. However, the systematic effects that this HWP will introduce in the overall instrument need to be investigated. We present a preliminary study of the impact of this dielectrically embedded HWP on the beam shape of a corrugated horn and its performance across the beam. Using a W-band Vector Network Analyser, we measured the co- and crosspolarisation beams of the HWP-horn system and the differential phase-shift introduced by the HWP across the beam.

Paper Details

Date Published: 24 September 2012
PDF: 8 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84520K (24 September 2012); doi: 10.1117/12.926683
Show Author Affiliations
B. Maffei, The Univ. of Manchester (United Kingdom)
G. Pisano, The Univ. of Manchester (United Kingdom)
M. W. Ng, The Univ. of Manchester (United Kingdom)
V. C. Haynes, The Univ. of Manchester (United Kingdom)


Published in SPIE Proceedings Vol. 8452:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Wayne S. Holland, Editor(s)

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