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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Related Experiment Video

Updated: May 8, 2025

Phase Contrast and Differential Interference Contrast DIC Microscopy
06:49

Phase Contrast and Differential Interference Contrast DIC Microscopy

Published on: August 6, 2008

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Nonlinear differential interference contrast imaging.

Fei Lin, Ling Hong, Yu Zhang

    Optics Letters
    |February 14, 2025
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed nonlinear DIC imaging to overcome infrared illumination challenges. This novel upconversion technique visualizes infrared phase information, advancing biological research and medical diagnostics.

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    Last Updated: May 8, 2025

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    Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope
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    Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Nonlinear Optics

    Background:

    • Differential interference contrast (DIC) imaging is crucial for biological research and medical diagnostics.
    • Direct infrared (IR) DIC imaging is challenging due to camera limitations, despite its urgent need in various fields.
    • Existing DIC methods struggle with IR illumination, hindering applications requiring deep tissue penetration or reduced phototoxicity.

    Purpose of the Study:

    • To develop a novel method for direct infrared DIC imaging.
    • To overcome the limitations of current DIC techniques in the infrared spectrum.
    • To enable phase contrast imaging using infrared illumination for advanced microscopy.

    Main Methods:

    • Leveraging the nonlinear optical walk-off effect to create a nonlinear beam displacer (NBD).
    • Utilizing two quadrature-cascaded type I nonlinear crystals within the NBD.
    • Implementing nonlinear coupling between an IR object beam and a pump beam to generate visible light.

    Main Results:

    • Successfully generated two orthogonally polarized visible beams from an IR beam via nonlinear upconversion.
    • Achieved lateral shear interference for DIC imaging by controlling beam polarization.
    • Visualized phase discontinuities of an object using infrared illumination through nonlinear DIC.

    Conclusions:

    • Introduced nonlinear DIC imaging, enabling upconversion of infrared phase information to the visible spectrum.
    • The NBD scheme effectively overcomes the limitations of IR DIC imaging.
    • This breakthrough paves the way for infrared phase microscopy and broader applications in life sciences and diagnostics.