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Related Concept Videos

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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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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Related Experiment Video

Updated: Jun 22, 2026

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
07:03

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Published on: August 15, 2018

Low-coherence interference microscopy using a ferro-electric liquid crystal phase-modulator.

Maitreyee Roy, Colin Sheppard, Parameswaran Hariharan

    Optics Express
    |May 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a computer-controlled microscope for precise surface mapping of micro-machined components. It utilizes a novel phase modulator for rapid and accurate shape analysis of complex surfaces.

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    Area of Science:

    • Optical Engineering
    • Metrology
    • Surface Science

    Background:

    • Accurate surface characterization is crucial for micro-manufacturing.
    • Existing methods may struggle with complex topographies like steps and discontinuities.

    Purpose of the Study:

    • To present a novel computer-controlled low-coherence interference microscope.
    • To enable rapid and accurate shape mapping of micro-machined surfaces.

    Main Methods:

    • Utilized a Linnik interferometer configuration.
    • Incorporated a fast, switchable achromatic phase modulator based on geometric phase.
    • Employed a pair of ferro-electric liquid crystal devices.

    Main Results:

    • Demonstrated rapid and accurate mapping of micro-machined surfaces.
    • Successfully characterized surfaces with steps and discontinuities.
    • The system's performance is attributed to the novel phase-modulator.

    Conclusions:

    • The developed microscope offers a significant advancement in surface metrology.
    • This technology facilitates precise quality control in micro-fabrication.
    • The achromatic phase modulator is key to the system's effectiveness.