Full Stokes polarimetry using dual-frequency liquid crystals

K. Nagaraju; D. V. S. Phanindra; S. Krishna Prasad; D. S. Shankar Rao; P. Sreekumar

doi:10.1117/12.2312503

6 July 2018 Full Stokes polarimetry using dual-frequency liquid crystals

K. Nagaraju, D. V. S. Phanindra, S. Krishna Prasad, D. S. Shankar Rao, P. Sreekumar

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107024X (2018) https://doi.org/10.1117/12.2312503
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

Citation Download Citation

K. Nagaraju, D. V. S. Phanindra, S. Krishna Prasad, D. S. Shankar Rao, and P. Sreekumar "Full Stokes polarimetry using dual-frequency liquid crystals", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107024X (6 July 2018); https://doi.org/10.1117/12.2312503

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