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Frequency-stable liquid crystal lenses using a circumferentially segmented concentric electrode.

Wenbin Feng

    Optics Express
    |January 29, 2025
    PubMed
    Summary

    A novel segmented electrode design improves liquid crystal (LC) lenses by stabilizing the parabolic phase profile. This advancement ensures consistent optical performance across a wider frequency range for large-aperture LC lenses.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Large-aperture liquid crystal (LC) lenses face challenges with phase deviation from ideal parabolic profiles due to alternating current (AC) driving voltages.
    • Maintaining a stable parabolic phase profile is crucial for consistent optical performance in LC lenses.

    Purpose of the Study:

    • To propose and validate a circumferentially segmented concentric electrode design for large-aperture LC lenses.
    • To address and mitigate phase deviation issues caused by AC driving voltages.
    • To enhance the frequency stability and maintain a parabolic phase profile of LC lenses.

    Main Methods:

    • Development of an equivalent circuit model for the LC lens.
    • Analysis of voltage distribution with varying electrode segment numbers.
    • Fabrication and experimental testing of LC lenses with unsegmented and eight-segmented electrodes (5 mm aperture, 30 µm LC layer).

    Main Results:

    • Increasing electrode segments brings the voltage distribution closer to a parabolic profile.
    • The segmented electrode design significantly enhances frequency stability.
    • The eight-segmented LC lens maintained a nearly ideal parabolic phase profile up to 8 kHz.

    Conclusions:

    • The proposed circumferentially segmented concentric electrode is an effective solution for large-aperture LC lenses.
    • This design ensures a stable parabolic phase profile over a wider frequency range.
    • The segmented electrode approach offers improved frequency stability and optical performance for LC lenses.