Phase-controlled polarization modulators

Chuss, David T., Wollack, Edward J., Novakova, G., Pisano, Giampaolo ORCID: https://orcid.org/0000-0003-4302-5681, Eimer, J. R., Moseley, S. H., Krejny, M. and U-Yen, K. 2012. Phase-controlled polarization modulators. Presented at: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, Amsterdam, The Netherlands, 3-6 July 2012. Published in: Holland, Wayne S. ed. Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI. Proceedings of the SPIE (8452) Beliingham, WA: SPIE, 84521Y. 10.1117/12.925214

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Abstract

We report technology development of millimeter/submillimeter polarization modulators that operate by introducing a variable, controlled phase delay between two orthogonal polarization states. The variable-delay polarization modulator (VPM) operates via the introduction of a variable phase delay between two linear orthogonal polarization states, resulting in a variable mapping of a single linear polarization into a combination of that Stokes parameter and circular (Stokes V) polarization. Characterization of a prototype VPM is presented at 350 and 3000 microns. We also describe a modulator in which a variable phase delay is introduced between right- and left- circular polarization states. In this architecture, linear polarization is fully modulated. Each of these devices consists of a polarization diplexer parallel to and in front of a movable mirror. Modulation involves sub-wavelength translations of the mirror that change the magnitude of the phase delay.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	Modulators; Polarization; Mirrors; Modulation
Publisher:	SPIE
ISSN:	0277-786X
Last Modified:	25 Oct 2022 10:00
URI:	https://orca.cardiff.ac.uk/id/eprint/60780

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