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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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Updated: Jul 16, 2025

Large-area Scanning Probe Nanolithography Facilitated by Automated Alignment and Its Application to Substrate Fabrication for Cell Culture Studies
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Initial probe function construction in ptychography based on zone-plate optics.

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    Accurate initial probe models are crucial for high-resolution X-ray ptychography using Fresnel zone plates. Elaborately constructed models significantly improve reconstruction quality and experimental efficiency.

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    Area of Science:

    • Coherent diffraction imaging
    • X-ray microscopy
    • Materials science

    Background:

    • X-ray ptychography offers ultrahigh resolution for analyzing extended samples.
    • Fresnel zone plates (FZPs) are standard optical probe systems in X-ray ptychography.
    • Probe function accuracy is critical for successful FZP-based ptychography, especially with curved wavefronts.

    Purpose of the Study:

    • To investigate the impact of various initial probe models (IPMs) on FZP-based ptychography reconstruction.
    • To compare the performance of single-mode and multi-mode IPMs in simulated and experimental settings.
    • To identify optimal IPMs for enhancing image quality and experimental efficiency.

    Main Methods:

    • Construction of four single-mode and three multi-mode initial probe models.
    • Systematic comparison of simulated and experimental reconstructions using different IPMs.
    • Evaluation of IPM performance in both near-focus and defocus conditions.

    Main Results:

    • Fresnel, spherical, and Fresnel-based multi-mode IPMs enable successful reconstructions in both near-focus and defocus cases.
    • Random and constant IPMs are only effective for near-focus reconstructions.
    • IPMs with high phase similarity to experimental probes enhance reconstruction quality and reduce sample radiation damage.

    Conclusions:

    • Elaborately constructed IPMs are superior to simple models (random, constant) for FZP-based ptychography.
    • Accurate IPMs are essential for achieving high-quality reconstructions and improving experimental efficiency.
    • Optimized IPMs can minimize radiation damage to samples during X-ray ptychography experiments.