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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

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High throughput second harmonic imaging for label-free biological applications.

Carlos Macias-Romero, Marie E P Didier, Pascal Jourdain

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    We enhanced second harmonic generation (SHG) microscopy throughput by 2-3 orders of magnitude using wide-field imaging. This breakthrough enables faster, low-fluence imaging of biological samples like living neurons.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Materials Science

    Background:

    • Second harmonic generation (SHG) microscopy is sensitive to interfacial processes due to its dependence on non-centrosymmetric materials.
    • Current SHG imaging speeds limit its application in dynamic biological studies.
    • Improving imaging throughput is crucial for real-time observation of cellular and interfacial phenomena.

    Purpose of the Study:

    • To significantly enhance the imaging throughput of SHG microscopy.
    • To develop a faster SHG imaging method for sensitive biological applications.
    • To demonstrate the capability of the improved system for imaging living biological structures.

    Main Methods:

    • Implemented a wide-field imaging scheme for SHG microscopy.
    • Utilized a medium-repetition-rate amplified near-infrared femtosecond laser and gated detection.
    • Compared imaging throughput with commercial point-scanning configurations using BaTiO₃ nanoparticles.

    Main Results:

    • Achieved a 2-3 orders of magnitude improvement in SHG imaging throughput compared to point-scanning methods.
    • Demonstrated high optical image contrast in wide-field SHG setups.
    • Successfully performed low-fluence imaging of living mammalian neurons.

    Conclusions:

    • The developed wide-field SHG microscopy significantly boosts imaging speed.
    • This advancement allows for rapid, non-invasive imaging of biological samples.
    • The technique holds promise for advancing in-situ studies of cellular dynamics and interfacial chemistry.