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    We introduce MISHELF microscopy, a novel lensless holographic microscope using multi-wavelength illumination for high-resolution quantitative phase imaging. This method enables clear, micron-range biological imaging of dynamic events with twin image elimination.

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    Area of Science:

    • Optical microscopy
    • Holography
    • Quantitative phase imaging

    Background:

    • Lensless microscopy offers advantages in simplicity and cost.
    • Quantitative phase imaging (QPI) is crucial for label-free biological sample analysis.
    • Existing lensless methods face challenges in resolution and speed.

    Purpose of the Study:

    • To present a novel lensless holographic microscope, MISHELF (Multi-Illumination Single-Holographic-Exposure Lensless Fresnel) microscopy.
    • To develop and validate a fast iterative phase retrieval algorithm for high-resolution QPI.
    • To demonstrate the capability of MISHELF microscopy for imaging dynamic biological events.

    Main Methods:

    • Simultaneous illumination and recording of multiple diffraction patterns in the Fresnel domain.
    • Implementation of a novel, fast iterative phase retrieval algorithm for twin image elimination.
    • Experimental validation using a synthetic resolution test target and a biological sample (swine sperm).

    Main Results:

    • Achieved high-resolution (micron range) quantitative phase imaging.
    • Successfully eliminated twin images, improving image clarity.
    • Demonstrated the ability to image dynamic events using three illumination wavelengths (RGB).

    Conclusions:

    • MISHELF microscopy provides a powerful alternative for lensless imaging.
    • The developed algorithm enhances phase retrieval speed and accuracy.
    • This technique improves the capabilities of existing lensless microscopes for biological applications.