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Lensfree dynamic super-resolved phase imaging based on active micro-scanning.

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    We developed a new super-resolution (SR) phase imaging method using lensfree microscopy and active micro-scanning. This technique achieves high-resolution, quantitative phase imaging of dynamic biological samples without labels.

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    Area of Science:

    • Biomedical Imaging
    • Microscopy
    • Optics

    Background:

    • Lensfree microscopy offers a compact and cost-effective alternative to conventional microscopes.
    • Achieving super-resolution (SR) phase imaging in lensfree setups remains challenging.
    • Dynamic phase imaging is crucial for observing unstained biological processes.

    Purpose of the Study:

    • To introduce a novel active micro-scanning imaging platform for lensfree microscopy.
    • To develop a super-resolution (SR) phase retrieval method for dynamic imaging.
    • To demonstrate enhanced spatial resolution beyond the diffraction limit in lensfree phase imaging.

    Main Methods:

    • Utilized a nearly coherent illumination system with rotating parallel plates for controllable source micro-scanning.
    • Acquired sequential low-resolution, sub-pixel-shifted holograms.
    • Employed a super-resolution (SR) phase retrieval algorithm to reconstruct quantitative phase images.

    Main Results:

    • Achieved a half-pitch lateral resolution of 775 nm on a quantitative phase microscopy target (QPT™).
    • Demonstrated a resolution 2.15 times beyond the Nyquist-Shannon limit for the sensor's pixel size.
    • Successfully imaged unstained HeLa cells, showcasing the platform's utility for dynamic analysis.

    Conclusions:

    • The developed active micro-scanning platform enables super-resolution (SR) dynamic phase imaging in a lensfree configuration.
    • This method significantly enhances spatial resolution in quantitative phase microscopy.
    • The technique is a promising tool for high-throughput, label-free analysis of biological samples.