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Sampling requirements in near-field ptychography.

Luca Fardin, Yelyzaveta Pulnova, Tomáš Parkman

    Optics Express
    |April 12, 2025
    PubMed
    Summary

    This study analyzes sampling requirements for near-field ptychography, a lensless microscopy technique. The findings generalize conditions for both near- and far-field setups, enabling wider applications, especially with low-brilliance sources.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Biophysics

    Background:

    • Ptychography is a versatile lensless microscopy technique used across scientific disciplines.
    • The near-field ptychography setup, a recent advancement, offers significant potential yet to be fully realized.
    • Current understanding of near-field ptychography has limitations regarding optimal experimental design.

    Purpose of the Study:

    • To analyze and generalize the sampling requirements for near-field ptychography.
    • To harmonize the theoretical framework for both near-field and far-field ptychography.
    • To provide guidelines for optimizing near-field ptychography experiments, particularly for low-brilliance sources.

    Main Methods:

    • Analytical generalization of sampling conditions using the fractional Fourier transform formalism.
    • Leveraging existing literature characterizations of ptychography setups.
    • Computational simulations to validate theoretical findings.

    Main Results:

    • Derived generalized sampling conditions applicable to both near-field and far-field ptychography.
    • Demonstrated harmonization of sampling requirements across different ptychography regimes.
    • Identified strategies to optimize experimental setups and data acquisition for near-field ptychography.

    Conclusions:

    • The generalized sampling conditions expand the applicability of ptychography, especially for low-brilliance sources.
    • This work provides crucial insights for advancing near-field ptychography experiments.
    • The findings pave the way for broader adoption of ptychography in various scientific fields.