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Low voltage polymer network liquid crystal for infrared spatial light modulators.

Fenglin Peng, Daming Xu, Haiwei Chen

    Optics Express
    |April 4, 2015
    PubMed
    Summary

    We developed a low-voltage, fast-response polymer network liquid crystal (PNLC) infrared phase modulator. Optimized UV curing and a large dielectric anisotropy liquid crystal (LC) host achieved a 22.8V phase change at 1.55μm with a 1ms response time.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Photonics

    Background:

    • Polymer network liquid crystals (PNLCs) offer potential for optical modulation.
    • Achieving low operating voltage and fast response times in PNLCs remains a challenge for infrared applications.

    Purpose of the Study:

    • To develop a low-voltage and fast-response polymer network liquid crystal (PNLC) infrared phase modulator.
    • To optimize PNLC device performance by understanding the effect of curing temperature on domain size.

    Main Methods:

    • Proposed a physical model to correlate UV curing temperature with average domain size in PNLCs.
    • Experimentally validated the physical model.
    • Optimized UV curing temperature and utilized a liquid crystal (LC) host with large dielectric anisotropy.

    Main Results:

    • Achieved a low 2π phase change voltage of 22.8V at a 1.55μm wavelength.
    • Maintained a fast response time of approximately 1 ms.
    • Demonstrated good agreement between the physical model and experimental results for domain size.

    Conclusions:

    • The developed PNLC infrared phase modulator exhibits excellent low-voltage and fast-response characteristics.
    • The physical model provides valuable insights for optimizing PNLC performance.
    • PNLCs are suitable for integration into high-resolution liquid-crystal-on-silicon (LCoS) infrared spatial light modulators.