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Compact compound-eye imaging module based on the phase diffractive microlens array for biometric fingerprint

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    A novel compound-eye imaging system utilizes phase diffractive microlenses for compact, flat optics. This system enables high-resolution fingerprint imaging with a simplified, planar design.

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    Area of Science:

    • Optics and Photonics
    • Micro-optics and Imaging Systems

    Background:

    • Traditional compound-eye imaging systems often use refractive microlenses, which can be bulky.
    • Diffractive microlenses offer advantages like thin profiles, high relative apertures, and compatibility with microfabrication.

    Purpose of the Study:

    • To propose and demonstrate a compact compound-eye imaging system using phase diffractive microlenses.
    • To develop an efficient image reconstruction method for this system.
    • To integrate fingerprint imaging capabilities into a planar device.

    Main Methods:

    • Fabrication of a phase Fresnel microlens array using gray-scale laser direct write equipment.
    • Development of an image reconstruction algorithm by extracting individual microlens data.
    • Integration of waveguide backlighting for planar illumination and touch panel functionality.

    Main Results:

    • A compact fingerprint imaging module was successfully demonstrated.
    • The system achieved a minimal device length limited by the microlens focal length (4.12f).
    • Effective image reconstruction was achieved by simplifying the system's optical path.

    Conclusions:

    • The proposed compound-eye imaging system offers a compact and efficient solution for imaging applications.
    • The use of phase diffractive microlenses and planar optics paves the way for novel compact imaging devices.
    • This technology has potential applications in areas requiring high-resolution, miniaturized imaging, such as biometric identification.