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Coupling optimized bending-insensitive multi-core fibers for lensless endoscopy.

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    Researchers developed a novel bending-insensitive multi-core fiber (MCF) for lensless endoscopy. A modified fiber geometry with straight ends improves light coupling, enhancing imaging capabilities for flexible endoscopes.

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    Area of Science:

    • Optical Engineering
    • Biomedical Imaging
    • Materials Science

    Background:

    • Existing bending-insensitive multi-core fibers (MCFs) use twisted fiber geometry for flexibility.
    • Twisted MCFs exhibit complex light coupling due to core orientation varying with radial distance.
    • This complexity can degrade imaging performance in lensless endoscopic applications.

    Purpose of the Study:

    • To develop a bending-insensitive MCF for lensless endoscopy with improved light coupling.
    • To overcome the coupling limitations of previously reported twisted MCFs.
    • To enable enhanced imaging capabilities for flexible endoscopic devices.

    Main Methods:

    • Modified the geometry of the multi-core fiber.
    • Introduced a 1 cm section with straight, parallel cores at both ends of the MCF.
    • Evaluated the impact of this modification on light coupling and imaging performance.

    Main Results:

    • The modified MCF geometry rectifies light coupling and output issues.
    • Achieved optimal light coupling into and out of individual cores.
    • Demonstrated the potential for improved lensless endoscopic imaging.

    Conclusions:

    • A modified MCF with straight end sections offers a solution for complex light coupling in twisted MCFs.
    • This approach enables the development of high-performance, bend-insensitive lensless endoscopes.
    • The technology has potential applications in dynamic and freely moving experimental setups.