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Digital micromirror device-based common-path quantitative phase imaging.

Cheng Zheng, Renjie Zhou, Cuifang Kuang

    Optics Letters
    |April 1, 2017
    PubMed
    Summary
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    We developed a new common-path quantitative phase imaging (QPI) method using a digital micromirror device (DMD). This technique enhances accuracy and simplifies alignment for advanced microscopy applications.

    Area of Science:

    • Optical microscopy
    • Biophysics
    • Nanotechnology

    Background:

    • Quantitative phase imaging (QPI) is crucial for label-free cell analysis.
    • Existing QPI methods face challenges with noise and complex alignment.
    • Digital micromirror devices (DMDs) offer programmable illumination control.

    Purpose of the Study:

    • To introduce a novel common-path QPI system utilizing a DMD.
    • To enhance phase measurement accuracy and reduce noise.
    • To simplify system operation and enable broader adoption.

    Main Methods:

    • A common-path QPI setup incorporating a DMD for generating dual plane waves.
    • A pinhole in the detection arm to establish a reference beam.
    • A liquid crystal device to mitigate specular reflection noise.

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    Main Results:

    • Achieved high sensitivity QPI with spatial noise of 4.92 nm and temporal noise of 2.16 nm.
    • Demonstrated accurate phase measurements using calibrated polystyrene beads.
    • Successfully imaged dynamic red blood cell membrane fluctuations, validating live cell imaging capability.

    Conclusions:

    • The proposed DMD-based common-path QPI system offers high sensitivity and accuracy.
    • The system simplifies alignment and allows for adjustable fringe periods.
    • This technology facilitates system miniaturization and automation for wider applications.