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Confocal microscopy through a multimode fiber using optical correlation.

Damien Loterie, Sebastianus A Goorden, Demetri Psaltis

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    Researchers developed a new method for confocal imaging through multimode fibers using optical correlation. This technique enables spatial selectivity for clearer imaging of microscopic samples.

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    Area of Science:

    • Biomedical Optics
    • Microscopy
    • Fiber Optics

    Background:

    • Confocal imaging offers high-resolution optical microscopy.
    • Multimode fibers are challenging for high-resolution imaging due to light distortion.
    • Existing methods for imaging through multimode fibers often require complex setups or invasive procedures.

    Purpose of the Study:

    • To develop a novel method for achieving confocal imaging through multimode fibers.
    • To demonstrate spatial selectivity in detection for improved imaging quality.
    • To validate the technique on various microscopic samples.

    Main Methods:

    • Optical correlation was employed to achieve confocal imaging.
    • A calibration step measured the fiber's transmission matrix.
    • Wavefront shaping created focused spots, which were scanned across a sample.
    • Returning light was optically correlated with the input pattern for spatial selectivity.

    Main Results:

    • The method successfully enabled confocal imaging through multimode fibers.
    • Spatial selectivity in detection was achieved, enhancing image clarity.
    • The technique was demonstrated on microbeads, a dried epithelial cell, and a cover glass.

    Conclusions:

    • Optical correlation provides an effective approach for confocal imaging via multimode fibers.
    • This method offers a pathway for advanced microscopic imaging in challenging environments.
    • The demonstrated technique shows potential for various applications in biological and material sciences.