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    Developing polychromatic ptychography offers efficient phase retrieval in extreme ultraviolet (EUV) imaging. This new method expresses exit waves using transmission and thickness functions, providing an alternative to existing techniques.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Computational Imaging

    Background:

    • Phase retrieval in the extreme ultraviolet (EUV) regime is crucial for advanced imaging.
    • Existing methods like ptychographic information multiplexing (PIM) have limitations in efficiency.
    • Polychromatic ptychography offers a potential solution for more efficient phase retrieval.

    Purpose of the Study:

    • To develop and numerically validate a novel polychromatic ptychography scheme for efficient EUV phase retrieval.
    • To present an alternative to the PIM method by expressing monochromatic exit waves differently.
    • To analyze the impact of sampling on reconstruction quality in polychromatic ptychography.

    Main Methods:

    • A gradient-based algorithm is proposed for phase retrieval.
    • The scheme expresses monochromatic exit waves using the object's transmission and thickness functions.
    • Numerical simulations are employed to validate the algorithm's performance.

    Main Results:

    • The proposed gradient-based method demonstrates the feasibility of the new polychromatic ptychography scheme.
    • The study numerically validates the effectiveness of expressing exit waves via transmission and thickness functions.
    • The influence of sampling on reconstruction quality in polychromatic ptychography is investigated.

    Conclusions:

    • The presented polychromatic ptychography scheme offers a viable and potentially more efficient alternative for EUV phase retrieval.
    • The findings highlight the importance of considering sampling strategies for optimal reconstruction in polychromatic imaging.
    • Further research can explore experimental implementation and optimization of the proposed method.