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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Temporal phase-unwrapping algorithm for dynamic interference pattern analysis in interference-contrast microscopy.

L R van den Doel, L J van Vliet

    Applied Optics
    |March 25, 2008
    PubMed
    Summary

    A new temporal phase-unwrapping algorithm analyzes dynamic interference patterns from microscopy. This method precisely measures height differences of objects on vial bottoms, achieving ~5 nm precision.

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    Area of Science:

    • Optical microscopy
    • Nanotechnology
    • Surface science

    Background:

    • Interference-contrast microscopy visualizes dynamic fringe patterns at liquid interfaces in micromachined vials.
    • These patterns arise from light interference, with optical path difference (OPD) related to liquid depth.
    • Evaporation-induced OPD changes at the meniscus create observable interferograms.

    Purpose of the Study:

    • To develop and validate a temporal phase-unwrapping algorithm for analyzing dynamic interference patterns.
    • To precisely measure meniscus profiles and object heights in micromachined picoliter vials.
    • To apply the algorithm for high-precision height difference measurements (~5 nm).

    Main Methods:

    • Developed a temporal phase-unwrapping algorithm for dynamic interference pattern analysis.
    • Utilized interference-contrast microscopy of liquid samples in micromachined silicon dioxide vials (6 µm depth).
    • Applied classical electromagnetic theory to describe the microscopy and interferogram formation.

    Main Results:

    • The algorithm successfully retrieves meniscus profiles from interference patterns.
    • Phase jumps in fringe patterns directly correlate to object heights on the vial bottom.
    • Demonstrated ~5 nm precision in measuring height differences of objects.

    Conclusions:

    • The developed temporal phase-unwrapping algorithm enables precise analysis of dynamic interference patterns.
    • This technique allows for accurate monitoring of meniscus dynamics and object height measurements in microfluidic devices.
    • The method offers a valuable tool for nanoscale metrology in microfabricated systems.