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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Polymer Science

    Background:

    • Cholesteric liquid crystals (CLCs) traditionally suffer from stability and hysteresis issues.
    • Achieving uniform lying helix (ULH) structures is crucial for advanced CLC device performance.
    • Polymer-free CLCs offer potential for improved optical properties but present fabrication challenges.

    Purpose of the Study:

    • To overcome stability and hysteresis limitations in polymer-free CLCs.
    • To demonstrate high-speed and high-precision analog modulation using CLCs.
    • To characterize the performance of a novel CLC device for optical applications.

    Main Methods:

    • Fabrication of polymer-free CLCs with a homogeneous uniform lying helix structure.
    • Implementation of a transverse field switching configuration with a flat substrate.
    • Measurement of response times and sinusoidal transmission fidelity using a Michelson interferometer.

    Main Results:

    • Achieved stable, hysteresis-free ULH structures in polymer-free CLCs.
    • Demonstrated analog modulation with response times as low as 10 ms at room temperature.
    • Obtained R-squared values > 0.9993 for sinusoidal transmissions from 1 Hz to 100 kHz.
    • Measured a phase shift of approximately π/9 at 4.6 V/µm for chiral-doped nematic mixtures E7.

    Conclusions:

    • The developed polymer-free CLC technology enables stable, high-speed analog modulation.
    • The precise control over CLC structures leads to exceptional performance in optical modulation.
    • This work paves the way for advanced optoelectronic devices requiring fast and accurate signal processing.