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Full Stokes polarimetry using dual-frequency liquid crystals
Author(s): K. Nagaraju; D. V. S. Phanindra; S. Krishna Prasad; D. S. Shankar Rao; P. Sreekumar
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Paper Abstract

In a dual-frequency liquid crystal (DFLC), when the frequency of the applied voltage is more than a critical value (fc), the dielectric anisotropy of the material changes from positive to negative. This causes the director to switch its orientation from parallel to the field (for f < fc), to perpendicular to it (f < fc). Hence DFLC can be used in modulating the light by switching the frequency of an externally applied voltage. We present in this work about application of DFLCs in full Stokes polarimetery. A polarization modulator has been worked out based on two DFLCs and two static retarders. The combination of DFLCs’ switching and static retarders are chosen such that more or less equal weightage is given to all the Stokes parameters. Initial results on the optimization of position angles of the modulators are presented towards the goal of achieving polychromatic modulator in the wavelength range 600-900 nm.

Paper Details

Date Published: 6 July 2018
PDF: 7 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107024X (6 July 2018); doi: 10.1117/12.2312503
Show Author Affiliations
K. Nagaraju, Indian Institute of Astrophysics (India)
D. V. S. Phanindra, Indian Institute of Astrophysics (India)
S. Krishna Prasad, Ctr. for Nano and Soft Matter Sciences (India)
D. S. Shankar Rao, Ctr. for Nano and Soft Matter Sciences (India)
P. Sreekumar, Indian Institute of Astrophysics (India)

Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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