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Updated: Aug 17, 2025

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Diffractive lensless imaging with optimized Voronoi-Fresnel phase.

Qiang Fu, Dong-Ming Yan, Wolfgang Heidrich

    Optics Express
    |December 16, 2022
    PubMed
    Summary

    Researchers developed a novel lensless camera using a diffractive Voronoi-Fresnel phase for superior image quality. This compact imaging technology enhances computational reconstruction and performs well in various lighting conditions.

    Area of Science:

    • Optics and Photonics
    • Computational Imaging

    Background:

    • Lensless cameras offer miniaturization by replacing traditional lenses with flat optics and computational algorithms.
    • Achieving high image quality in lensless systems remains a challenge.

    Purpose of the Study:

    • To develop a lensless camera with enhanced image quality using a novel diffractive optical element.
    • To establish a design principle for maximizing information acquisition in optical systems for improved computational reconstruction.

    Main Methods:

    • Designed a diffractive lensless camera incorporating a spatially-coded Voronoi-Fresnel phase.
    • Utilized Modulation Transfer Function volume (MTFv) as an optimization metric in the Fourier domain.
    • Developed an optimization framework to guide the design of the diffractive optical element.

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    Main Results:

    • The Voronoi-Fresnel phase consists of an irregular array of quasi-Centroidal Voronoi cells with a Fresnel phase function.
    • A prototype Voronoi-Fresnel lensless camera demonstrated superior imaging performance compared to existing lensless cameras.
    • The system performed effectively across various illumination conditions on a 1.6-megapixel image sensor.

    Conclusions:

    • The proposed Voronoi-Fresnel diffractive lensless camera design achieves superior image quality.
    • This technology has the potential to advance the development of compact imaging systems for challenging environments.