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Miniaturized coded ptychographic microscopy via spherical wave illumination.

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    This study introduces a compact coded ptychographic microscopy (CPM) prototype that improves resolution by accurately modeling the light source as a spherical wave, overcoming limitations of the plane wave assumption for miniaturized systems.

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    Area of Science:

    • Optics and Imaging Science
    • Computational Microscopy
    • Lensless Imaging Techniques

    Background:

    • Coded ptychographic microscopy (CPM) is a lensless imaging technique for high-throughput microscopy.
    • The conventional plane wave assumption in CPM limits miniaturization and imaging quality at reduced source-to-sample distances.
    • Failure of the plane wave approximation introduces ambiguities in reconstructed micrographs.

    Purpose of the Study:

    • To develop a compact CPM prototype that overcomes the limitations of the plane wave assumption.
    • To enhance imaging quality and enable miniaturization of CPM systems.
    • To improve resolution in CPM under close-range conditions.

    Main Methods:

    • Developed a compact prototype utilizing a spherical wave model for the light source.
    • Implemented an accurate computational method to estimate the light source's spatial position.
    • Used a translation calibration method for precise object displacement calculation.
    • Employed iterative decoupling of the light source and object during reconstruction to mitigate image degradation.

    Main Results:

    • Achieved a 25.5% resolution improvement compared to plane wave-based CPM under close-range conditions.
    • Demonstrated successful mitigation of image degradation caused by reduced source-to-sample distance.
    • Validated the computational method and translation calibration through simulations and experiments.

    Conclusions:

    • The developed compact CPM prototype with spherical wave modeling significantly enhances resolution and enables miniaturization.
    • This approach addresses critical limitations of conventional CPM, paving the way for advanced applications.
    • Potential applications include digital pathology and cytometric analysis requiring high-resolution, miniaturized imaging systems.