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Related Experiment Video

Updated: Apr 27, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Alignment and temperature effects in liquid-crystal-based active polarimetry.

James C Gladish, Donald D Duncan

    Applied Optics
    |July 1, 2014
    PubMed
    Summary

    Alignment and temperature variations in liquid crystal variable retarders (LCVRs) cause errors in polarimetry. This study models these effects to improve Mueller matrix accuracy and understand individual LCVR contributions.

    Area of Science:

    • Optical Engineering
    • Metrology
    • Materials Science

    Background:

    • Liquid crystal variable retarders (LCVRs) are crucial for active polarimetry.
    • Alignment and temperature fluctuations introduce systematic errors in polarimetric measurements.
    • Existing calibration methods often overlook the link between errors and specific Mueller matrix elements.

    Purpose of the Study:

    • To investigate the impact of alignment and temperature on LCVR-based polarimeters.
    • To develop a modified LCVR model accounting for these environmental factors.
    • To enhance the calibration process and Mueller matrix accuracy.

    Main Methods:

    • Simulations were performed on a Stokes generator and polarimeter system, each with two LCVRs.
    • An existing LCVR model was adapted to include alignment and temperature dependencies.

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  • The calibrated polarimeter was used to measure the Mueller matrix of air.

    • Main Results:

    • The modified model accurately reflects alignment and temperature effects on LCVRs.
    • Simulations revealed how these effects propagate to Mueller matrix elements.
    • The study demonstrates a method to associate specific errors with individual LCVR components.

    Conclusions:

    • Accounting for alignment and temperature in LCVR models is essential for accurate polarimetry.
    • This approach provides a pathway to identify and mitigate systematic errors.
    • Understanding individual LCVR effects aids in optimizing polarimeter design and performance.