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Variable-focus liquid lens based on electrically responsive fluid.

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    A new adaptive liquid lens utilizes dibutyl adipate (DBA), an electrically responsive fluid, to dynamically adjust its shape and focal length. This novel fluid lens offers excellent imaging properties and stability for advanced optical applications.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Fluid Dynamics

    Background:

    • Adaptive liquid lenses offer tunable optical properties.
    • Electrically responsive fluids are crucial for dynamic lens control.
    • Previous materials faced limitations in stability or performance.

    Purpose of the Study:

    • To demonstrate a novel adaptive liquid lens using dibutyl adipate (DBA).
    • To investigate the voltage-dependent curvature change and focal length tunability of the DBA lens.
    • To evaluate the imaging performance and stability of the proposed liquid lens.

    Main Methods:

    • Fabrication of a hemispherical plano-convex liquid lens using DBA.
    • Application of direct current (DC) electric fields to induce electrostatic forces and deform the lens.
    • Measurement of focal length variation with applied voltage (0-100 V).
    • Assessment of lens resolution and optical transmittance.

    Main Results:

    • The DBA liquid lens successfully changed curvature upon voltage application.
    • Focal length was tuned from 7.5 mm to 13.1 mm with increasing voltage.
    • High optical transmittance (~95%) and resolution (~28.5 lp/mm) were achieved.
    • The lens demonstrated good thermal stability (20-100°C).

    Conclusions:

    • Dibutyl adipate (DBA) is a viable electrically responsive fluid for adaptive liquid lenses.
    • The proposed DBA liquid lens offers tunable focal length and excellent imaging quality.
    • The simple structure and robust performance suggest DBA's potential for next-generation adaptive optics.