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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Single-path single-shot phase-shifting digital holographic microscopy without a laser light source.

Tatsuki Tahara, Yuichi Kozawa, Ryutaro Oi

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    |February 25, 2022
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    Summary

    We developed single-path single-shot phase-shifting digital holographic microscopy (SSP-DHM) for label-free imaging. This method acquires quantitative phase information without a laser, enabling rapid imaging of transparent specimens.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Microscopy

    Background:

    • Quantitative phase imaging provides label-free contrast for transparent specimens.
    • Traditional digital holographic microscopy often requires a laser source and multiple sequential acquisitions.

    Purpose of the Study:

    • To introduce a novel single-path single-shot phase-shifting digital holographic microscopy (SSP-DHM) technique.
    • To demonstrate label-free quantitative phase and complex amplitude imaging without a laser.
    • To showcase the capability for high-speed imaging of dynamic transparent samples.

    Main Methods:

    • Simultaneous acquisition of multiple phase-shifted holograms using a linear polarizer, liquid crystal on a silicon spatial light modulator (LCoS-SLM), and a polarization-imaging camera.
    • Single-path optical configuration to simplify the setup.
    • Single-shot acquisition to capture dynamic events.

    Main Results:

    • Successful complex amplitude imaging of a USAF1951 test target.
    • Quantitative phase imaging of transparent HeLa cells demonstrated.
    • Motion-picture imaging of transparent particles achieved, highlighting single-shot capability.

    Conclusions:

    • SSP-DHM offers a robust, laser-free approach for quantitative phase imaging.
    • The single-shot capability is crucial for observing dynamic processes in transparent biological samples.
    • This technique advances label-free microscopy for diverse applications.