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Enhanced 3D spatial resolution in quantitative phase microscopy using spatially incoherent illumination.

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    This study introduces spatially incoherent illumination for quantitative phase imaging, enhancing 3D resolution by up to twofold. The method compensates for contrast loss, enabling accurate phase and intensity measurements for simplified diffraction tomography reconstruction.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Materials Science

    Background:

    • Quantitative phase imaging (QPI) is crucial for label-free microscopy.
    • Traditional QPI often relies on coherent illumination, limiting spatial frequency collection.
    • Overcoming the paraxial approximation in QPI is essential for advanced imaging.

    Purpose of the Study:

    • To develop a quantitative phase imaging technique using spatially incoherent illumination.
    • To enhance three-dimensional (3D) resolution in phase imaging beyond the paraxial approximation.
    • To enable simplified diffraction tomography reconstruction.

    Main Methods:

    • Utilizing spatially incoherent illumination for sample illumination.
    • Employing a quadriwave lateral shearing interferometer to collect electromagnetic field data.
    • Scanning image planes to capture the full image volume.
    • Simulating and compensating for image contrast loss caused by incoherent illumination.

    Main Results:

    • Achieved a 3D resolution increase of up to a factor of 2 compared to coherent methods.
    • Successfully restored quantitative phase and intensity values after contrast compensation.
    • Demonstrated experimental validation using polystyrene and TiO(2) micro-beads.

    Conclusions:

    • Spatially incoherent illumination offers enhanced 3D resolution in quantitative phase imaging.
    • Contrast loss compensation is effective in restoring quantitative accuracy.
    • The proposed method simplifies diffraction tomography setups and is applicable to various micro-bead samples.