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Related Experiment Video

Updated: Jun 24, 2025

Polymeric Microneedle Array Fabrication by Photolithography
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Polymeric microlens array formed on a discontinuous wetting surface using a self-assembly technique.

Miao Xu, Zhenyao Bian, Qilong Chen

    Applied Optics
    |June 10, 2024
    PubMed
    Summary
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    Researchers developed a simple, low-cost method to create polymeric microlens arrays (MLAs) using self-assembly on patterned surfaces. This technique avoids clean rooms and expensive equipment, offering a facile route to high-quality optical components.

    Area of Science:

    • Materials Science
    • Optics
    • Surface Chemistry

    Background:

    • Microlens arrays (MLAs) are crucial optical components.
    • Existing fabrication methods can be complex and costly.
    • Developing accessible fabrication techniques is essential.

    Purpose of the Study:

    • To demonstrate a facile and low-cost method for preparing polymeric microlens arrays (MLAs).
    • To utilize a self-assembly technique based on discontinuous wetting surfaces.
    • To achieve uniform MLA characteristics over large areas.

    Main Methods:

    • Preparation of a patterned hydrophobic-octadecyltrichlorosilane (OTS) surface via UV/O3 irradiation through a shadow mask.
    • Modification of surface energy from 23 to 72.8 mN/m after UV/O3 treatment.

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  • Formation of optical glue (NOA 81) droplets on a microhole array via surface tension for MLA fabrication.

    • Main Results:

    • Successful generation of a patterned hydrophobic/hydrophilic surface.
    • Uniform polymeric microlens arrays (MLAs) were fabricated using optical glue (NOA 81).
    • The fabricated MLAs exhibited excellent characteristics and uniform dimensions over large areas.

    Conclusions:

    • The developed method provides a simple, low-cost, and equipment-independent approach for MLA fabrication.
    • This technique enables the production of high-quality polymeric microlens arrays.
    • The self-assembly method offers a scalable solution for optical component manufacturing.