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Single-shot sequential projection phase retrieval and 3D localization from chromatic aberration.

Guocheng Zhou, Shaohui Zhang, Yao Hu

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    This study introduces a novel phase retrieval method using chromatic aberration and sequential projection. The technique enables digital refocusing and 3D localization of samples with high accuracy.

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    Area of Science:

    • Optics
    • Image Processing
    • Computational Imaging

    Background:

    • Phase retrieval is crucial for reconstructing object information from intensity measurements.
    • Chromatic aberration in optical systems can be a challenge but also exploited for new imaging modalities.

    Purpose of the Study:

    • To develop a novel phase retrieval method leveraging chromatic aberration.
    • To enable digital refocusing and 3D localization of samples using the developed method.

    Main Methods:

    • Utilized a red, green, and blue (RGB) LED, an objective, and a color camera.
    • Exploited objective's chromatic aberration to create equivalent propagation planes.
    • Employed sequential projection and iterative minimization of a convergence index for phase retrieval.
    • Applied angular spectrum propagation for digital refocusing and 3D localization.

    Main Results:

    • Successfully demonstrated phase retrieval from three color images corresponding to different propagation planes.
    • Achieved accurate digital refocusing and 3D localization of sample subregions.
    • Validated the method's feasibility through both simulations and experimental results.

    Conclusions:

    • The reported phase retrieval method effectively utilizes chromatic aberration for imaging.
    • The technique provides a viable approach for digital refocusing and 3D sample localization.
    • This method offers a new tool for quantitative phase imaging applications.