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Related Experiment Videos

Focus-tunable double convex lens based on non-ionic electroactive gel.

Dong-Soo Choi, Jaeu Jeong, Eun-Jae Shin

    Optics Express
    |October 19, 2017
    PubMed
    Summary
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    We developed a focus-tunable double-convex lens using a non-ionic PVC gel. This innovative lens offers adjustable focal lengths and high transmittance, ideal for close-up imaging applications.

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Traditional lenses face limitations in dynamic focusing capabilities, especially for close-conjugate applications.
    • The development of tunable lenses is crucial for advancing optical systems requiring adaptable focal lengths.

    Purpose of the Study:

    • To propose and characterize a novel focus-tunable double-convex (DCX) lens utilizing a non-ionic polyvinyl chloride (nPVC) gel.
    • To investigate the lens's performance, including focal length tunability and field-of-view, under varying applied voltages.

    Main Methods:

    • Fabrication of a DCX lens comprising an nPVC gel sandwiched between two plates with precisely arranged electrodes (anode and cathode).
    • Application of electrical voltage across the electrodes to induce pressure and alter the gel's shape, creating the double-convex lens profile.

    Related Experiment Videos

  • Systematic measurement of the lens's focal length and field-of-view across a voltage range of 0 V to 400 V.

    • Main Results:

    • The lens demonstrated tunable focal length, varying from 3 mm to 24.5 mm with applied voltages from 0 V to 400 V.
    • A significant decrease in the field-of-view was observed, reducing from 121.9° to 41.9° as voltage increased.
    • The proposed lens exhibited high optical transmittance, exceeding 94%.

    Conclusions:

    • The nPVC gel-based DCX lens offers effective focus tunability for close-conjugate applications.
    • The lens provides a wide range of focal length adjustment with good optical transparency.
    • This technology presents a promising solution for adaptable optical systems requiring dynamic focusing.