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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Structural color offers vibrant, angle-dependent hues without pigments.
    • Moiré patterns generated by overlapping arrays can produce dynamic visual effects.
    • Microlens arrays (MLA) and micropattern arrays (MPA) are key micro-optical components.

    Purpose of the Study:

    • To develop a low-cost method for generating 3D dynamic moiré images with structural color.
    • To enhance the iridescent properties of optical films.
    • To demonstrate motion-dependent visual effects in moiré images.

    Main Methods:

    • Overlaying a microlens array (MLA) onto a micropattern array (MPA) on polyester film.
    • Utilizing two types of filling structures within the MPA to achieve structural colors.
    • Modulating MLA structural parameters via thermal reflow to enhance iridescence.

    Main Results:

    • Vivid structural colors were successfully produced in the micropatterns.
    • The iridescent effect of the optical film was significantly enhanced through MLA modulation.
    • Both orthogonal and reverse relative motion effects were demonstrated in the moiré images.

    Conclusions:

    • The proposed microstructural device provides a cost-effective approach for creating dynamic structural color moiré images.
    • This technology is suitable for applications in green printing and anti-counterfeiting.
    • The combination of MLA and MPA offers a versatile platform for advanced optical functionalities.