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Related Experiment Video

Updated: May 9, 2025

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Ultrasound cholesteric liquid crystal color filter.

Jessica Onaka, Yuna Kim, Daisuke Koyama

    Optics Letters
    |May 1, 2025
    PubMed
    Summary

    We developed an ultrasonically tunable color filter using cholesteric liquid crystals (CLCs). Ultrasound dynamically adjusted the helical pitch, achieving a 60-nm spectral shift in CLC filters for tunable optical properties.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Acoustics

    Background:

    • Cholesteric liquid crystals (CLCs) exhibit unique optical properties dependent on their helical pitch.
    • Dynamic tuning of CLC optical properties is crucial for advanced display and filter technologies.
    • Existing tuning methods often lack speed, reversibility, or broad applicability.

    Purpose of the Study:

    • To investigate the feasibility of using ultrasonic waves to dynamically tune the optical properties of cholesteric liquid crystal (CLC) color filters.
    • To quantify the spectral shift and color tunability achieved through ultrasound actuation.
    • To demonstrate the reversibility of the color transition induced by ultrasound.

    Main Methods:

    • Fabrication of CLC cells with varying chiral dopant concentrations (4 wt%, 7 wt%, and 12 wt%).

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  • Application of ultrasonic waves to the CLC cells to modulate the helical pitch.
  • Spectroscopic analysis to measure transmission spectra and identify peak shifts.
  • Chromaticity analysis to evaluate color transitions.

    • Main Results:

    • Ultrasonic actuation successfully modulated the helical pitch of CLCs, leading to dynamic tuning of optical properties.
    • The CLC cell with 12 wt% chiral dopant showed the most significant spectral shift, from 511 nm to 451 nm (60 nm range).
    • Chromaticity analysis confirmed a reversible color transition, validating the effectiveness of ultrasound for tunable filters.

    Conclusions:

    • Ultrasonic excitation provides an effective method for dynamically tuning the optical characteristics of CLC-based color filters.
    • The demonstrated 60-nm tunable range highlights the potential for broadband color manipulation.
    • This ultrasonic tuning approach offers a promising, reversible, and non-contact method for advanced optical filter applications.