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Internally focused phase optical transfer function for spatial light interference microscopy.

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    We developed a new phase optical transfer function (POTF) called iPOTF, which assumes the objective focuses inside the sample. This iPOTF improves image contrast and reduces artifacts in high-resolution phase imaging.

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    Area of Science:

    • Optics and Photonics
    • Microscopy Imaging
    • Image Processing

    Background:

    • The phase optical transfer function (POTF) is essential for high-resolution phase imaging.
    • Existing POTF models do not align with experimental data and yield limited contrast improvement with persistent halo artifacts during deconvolution.

    Purpose of the Study:

    • To derive a new POTF model that accurately reflects experimental observations in phase imaging.
    • To enhance image deconvolution by reducing artifacts and improving contrast.

    Main Methods:

    • Derived a novel POTF, termed in-sample POTF (iPOTF), by assuming the objective lens is focused within the sample plane.
    • Applied the iPOTF model to image deconvolution processes.

    Main Results:

    • The new iPOTF model demonstrates closer agreement with experimental results compared to traditional POTF.
    • Deconvolution using iPOTF significantly enhances the contrast of faint structures.
    • iPOTF effectively reduces halo artifacts, outperforming the conventional POTF.

    Conclusions:

    • The assumption of objective focus within the sample is critical for accurate POTF modeling.
    • iPOTF offers a superior approach for deconvolution in high-resolution phase imaging, leading to clearer and more detailed images.