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Fabrication Process of Silicone-based Dielectric Elastomer Actuators
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Varifocal liquid lens driven by a conical dielectric elastomer actuator.

Yang Cheng, Zhikuo Li, Chuanxun Chen

    Applied Optics
    |October 18, 2022
    PubMed
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    We developed a compact varifocal liquid lens using a conical dielectric elastomer actuator. This innovative lens offers tunable focal length for diverse optical applications, including imaging systems.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Actuator Technology

    Background:

    • Varifocal lenses are crucial components in modern optical systems, finding applications in biomedicine, photography, smartphones, and virtual reality.
    • Existing varifocal lens technologies often face limitations in terms of size, complexity, or speed.
    • The demand for compact, efficient, and adaptable optical solutions continues to grow across various technological fields.

    Purpose of the Study:

    • To propose and demonstrate a novel varifocal liquid lens actuated by a conical dielectric elastomer.
    • To characterize the performance of the varifocal liquid lens, including its focal length tuning range, focal power variation, and response times.
    • To showcase the potential of this compact liquid lens for applications in miniaturized imaging systems.

    Main Methods:

    • Fabrication of a varifocal liquid lens utilizing a conical dielectric elastomer actuator.
    • Application of actuation voltage to the dielectric elastomer to alter the liquid droplet's surface curvature.
    • Measurement of the lens's focal length, focal power, and response times (rise and fall) under varying voltages.
    • Demonstration of the lens's ability to focus on objects at different distances without mechanical movement.

    Main Results:

    • The varifocal liquid lens achieved a focal length tuning range from 15.07 mm to 9.50 mm with an applied voltage from 0 kV to 5.0 kV.
    • A significant focal power variation of 35.5 Diopters was observed.
    • The lens exhibited rise and fall times of 215 ms and 293 ms, respectively.
    • The overall dimensions of the lens were measured at 9.4 mm in diameter and 12.5 mm in height.

    Conclusions:

    • The proposed varifocal liquid lens, driven by a conical dielectric elastomer actuator, successfully demonstrates tunable focal length.
    • The compact design and performance characteristics make it a promising candidate for advanced optical systems.
    • This technology has the potential to be integrated into various compact imaging devices, enhancing their functionality and adaptability.