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White-light diffraction phase microscopy at doubled space-bandwidth product.

Mingguang Shan, Mikhail E Kandel, Hassaan Majeed

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    This summary is machine-generated.

    White light diffraction microscopy (wDPM) now preserves spatial resolution and field of view by combining phase-shifting and off-axis techniques. This novel approach enhances quantitative phase imaging for biological samples.

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    Area of Science:

    • Optical microscopy
    • Quantitative phase imaging
    • Biomedical optics

    Background:

    • White light diffraction microscopy (wDPM) offers temporal and spatial phase sensitivity.
    • Off-axis quantitative phase imaging methods, including wDPM, face reduced space-bandwidth product, limiting resolution or field of view.
    • This limitation arises from interferogram period affecting ultimate image resolution.

    Purpose of the Study:

    • To develop a method that preserves the space-bandwidth product in white light diffraction microscopy.
    • To enhance quantitative phase imaging by combining phase-shifting and off-axis techniques.
    • To achieve high-resolution, low-noise phase measurements using white light illumination.

    Main Methods:

    • Developed phase-shifting diffraction phase microscopy with white light (PS-wDPM).
    • Measured and combined two phase-shifted interferograms.
    • Utilized white light illumination for reduced spatial noise (<1nm pathlength).

    Main Results:

    • Preserved the original space-bandwidth product by integrating phase-shifting with off-axis wDPM.
    • Achieved phase images with low spatial noise (<1nm pathlength) due to white light.
    • Demonstrated instrument operation using test samples, blood cells, and unlabeled prostate tissue.

    Conclusions:

    • Combining phase-shifting and off-axis techniques in wDPM overcomes the space-bandwidth limitation.
    • PS-wDPM provides high-resolution, low-noise quantitative phase imaging.
    • The developed method is effective for analyzing biological specimens like cells and tissue biopsies.