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Related Experiment Video

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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Electrically controlled polarization rotator using nematic liquid crystal.

Tenghao Li, Qingming Chen, Xuming Zhang

    Optics Express
    |January 18, 2019
    PubMed
    Summary

    We developed a planar polarization rotator using a nematic liquid crystal waveguide. This device offers electrically controlled polarization rotation with fast switching times, suitable for flexible photonics.

    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science

    Background:

    • Polarization control is crucial for optical systems.
    • Existing methods often lack planar integration or flexibility.

    Purpose of the Study:

    • To demonstrate a novel planar polarization rotator.
    • To investigate its performance using nematic liquid crystals and electric fields.

    Main Methods:

    • Fabrication of a polydimethylsiloxane (PDMS) waveguide device.
    • Application of a gradient electric field parallel to the substrate.
    • Characterization of polarization rotation and propagation loss at 532 nm.

    Main Results:

    • Achieved electrically-controlled polarization rotation.

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  • Demonstrated a switching time of 70 ms.
  • Measured a propagation loss of 9 dB/cm at 532 nm.

    • Conclusions:

    • The developed device offers a planar, electrically controlled polarization rotator.
    • Its soft material properties enable integration into planar lightwave circuits and flexible photonics.