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    This novel reflection-phase microscope uses time-varying speckle illumination for high-resolution imaging. It achieves superior lateral resolution and depth selectivity, enabling detailed study of cell membrane dynamics.

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    Area of Science:

    • Biophysics
    • Optical Microscopy
    • Cell Biology

    Background:

    • Quantitative phase microscopy is crucial for label-free cell imaging.
    • Existing transmission-based systems have limitations in resolution and sensitivity.
    • High-speed, high-resolution imaging of dynamic cellular processes is needed.

    Purpose of the Study:

    • To develop a quantitative reflection-phase microscope with enhanced resolution and sensitivity.
    • To demonstrate its capability in distinguishing surface-specific motion in cells.
    • To provide a tool for studying membrane dynamics in eukaryotic cells.

    Main Methods:

    • Utilizing time-varying speckle-field illumination for microscopy.
    • Employing off-axis interferometric detection for wide-field, single-shot imaging.
    • Quantitative phase measurement for axial motion detection.

    Main Results:

    • Achieved superior lateral resolution of 520 nm and depth selectivity of 1.03 μm.
    • Demonstrated phase sensitivity over 40 times higher than transmission systems.
    • Successfully distinguished top and bottom surface motion in red blood cells.

    Conclusions:

    • The developed reflection-phase microscope offers significant advantages in resolution and sensitivity.
    • It is suitable for high-speed measurements of dynamic cellular events.
    • This technique holds promise for advancing the study of membrane dynamics in complex cells.