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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

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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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Interference and Decay01:16

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Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
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Updated: Jan 30, 2026

Phase Contrast and Differential Interference Contrast DIC Microscopy
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Interference probe ptychography for computational amplitude and phase microscopy.

Dirk E Boonzajer Flaes, Stefan Witte

    Optics Express
    |January 18, 2019
    PubMed
    Summary
    This summary is machine-generated.

    We developed a robust Fresnel domain ptychography method using an interference pattern illumination. This technique simplifies imaging systems and achieves high-fidelity, quantitative phase contrast images with sub-micrometer resolution.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Materials Science

    Background:

    • Ptychography is a powerful lensless imaging technique that reconstructs object information from a series of diffraction patterns.
    • Traditional ptychography requires precise sample positioning and system stability, limiting its practical applications.
    • Developing robust and simplified imaging systems remains a key challenge in high-resolution microscopy.

    Purpose of the Study:

    • To introduce a novel Fresnel domain ptychography approach utilizing interference pattern illumination.
    • To demonstrate the system's ability to reconstruct high-fidelity object images with reduced requirements for sample positioning and system stability.
    • To showcase the potential of this method for biological sample imaging with quantitative phase contrast and high spatial resolution.

    Main Methods:

    • Developed a ptychographic imaging system where illumination is an interference pattern created by overlapping two coherent beams.
    • Scanned only the phase and orientation of the interferometric fringe pattern.
    • Reconstructed object images from Fresnel diffraction data using a modified ptychographical iterative engine.

    Main Results:

    • Achieved high-fidelity image reconstruction with simplified and robust imaging system construction.
    • Demonstrated quantitative phase contrast imaging of various biological samples.
    • Obtained a spatial resolution better than 2.2 μm.

    Conclusions:

    • The developed interference pattern illumination ptychography offers a simplified and robust alternative for high-resolution imaging.
    • This method alleviates stringent requirements for sample positioning and system stability, making it more accessible.
    • The technique shows significant promise for quantitative phase contrast imaging of biological specimens.