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High-resolution Fiber-optic Microendoscopy for in situ Cellular Imaging
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Tapered GRIN fiber microsensor.

Felipe Beltrán-Mejía, Claudecir R Biazoli, Cristiano M B Cordeiro

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    Tapering multimode fiber significantly enhances optical fiber microsensor sensitivity. This approach improves device performance and reduces size for space-constrained applications.

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    Area of Science:

    • Photonics and Optical Sensing
    • Fiber Optic Sensors
    • Intermodal Interference Devices

    Background:

    • Optical fiber microsensors often face limitations in sensitivity and size.
    • Intermodal interference in multimode fibers is a known sensing mechanism.
    • Graded Index (GRIN) fibers with parabolic refractive index profiles exhibit predictable ray paths.

    Purpose of the Study:

    • To improve the sensitivity of optical fiber microsensors based on intermodal interference.
    • To explore the effect of tapering multimode fiber extensions on sensor performance.
    • To reduce the physical footprint of these sensing devices for practical applications.

    Main Methods:

    • Tapering a short extension of multimode fiber (specifically Graded Index fibers).
    • Utilizing the modulation of the propagated beam's period during tapering (down-taper and up-taper).
    • Leveraging enhanced overlap between the evanescent field and the external medium.

    Main Results:

    • Substantial increase in microsensor sensitivity achieved by tuning the maximum sensitivity wavelength.
    • Significant reduction in device extension (by one order of magnitude).
    • Numerical and experimental validation of the proposed tapering method.

    Conclusions:

    • Tapering multimode fiber extensions is a feasible and effective method to enhance optical microsensor sensitivity.
    • The developed sensor is suitable for applications with space limitations.
    • This technique offers a pathway for more sensitive and compact fiber optic sensing solutions.