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    Researchers developed a flexible fiber probe for sub-diffraction imaging. This novel multicore-multimode fiber overcomes limitations of standard fibers, enabling high-resolution microscopy through long, flexible probes.

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    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Materials Science

    Background:

    • Ultra-thin multimode fibers offer high-resolution, minimally invasive microscopy.
    • Flexibility and length in practical probes degrade imaging performance.
    • Existing fiber microscopy methods struggle with probe flexibility challenges.

    Purpose of the Study:

    • To propose and demonstrate sub-diffraction imaging through a flexible probe.
    • To overcome the imaging limitations of long, flexible multimode fibers.
    • To enable high-resolution microscopy in challenging, flexible endoscopic applications.

    Main Methods:

    • Utilized a novel multicore-multimode fiber with 120 Fermat's spiral single-mode cores.
    • Employed structured light illumination optimized by the multicore design.
    • Applied computational compressive sensing for image reconstruction.
    • Demonstrated perturbation-resilient imaging through the flexible probe.

    Main Results:

    • Achieved sub-diffraction imaging capabilities through a flexible fiber probe.
    • Stable light delivery from single-mode cores to the multimode section was confirmed.
    • Fast imaging was demonstrated, resilient to perturbations introduced by probe flexibility.
    • Successfully reconstructed images with high spatial resolution from the flexible probe.

    Conclusions:

    • The developed multicore-multimode fiber probe enables high-resolution, sub-diffraction imaging in flexible configurations.
    • This technology overcomes critical limitations for minimally invasive endoscopic microscopy.
    • The approach offers a promising platform for advanced fiber-based imaging applications.