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Related Experiment Video

Updated: Mar 15, 2026

Writing Bragg Gratings in Multicore Fibers
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Refractometer probe based on a reflective carbon nanotube-modified microfiber Bragg grating.

Biqiang Jiang, Meng Xue, Chenyang Zhao

    Applied Optics
    |September 9, 2016
    PubMed
    Summary

    Carbon nanotube (CNT)-modified microfiber Bragg gratings enhance refractive index sensing. This novel sensor shows 15-fold higher sensitivity in low refractive index ranges for biochemical applications.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Optical Sensors

    Background:

    • Microfiber Bragg gratings (MFBGs) are used for sensing applications.
    • Carbon nanotubes (CNTs) offer unique optical and electrical properties.
    • Enhancing sensitivity in low refractive index regions is crucial for biochemical sensing.

    Purpose of the Study:

    • To propose and demonstrate a CNT-modified MFBG for enhanced refractive index (RI) sensing.
    • To investigate the effect of CNTs on the MFBG's evanescent field and spectral response.
    • To evaluate the sensitivity of the proposed sensor in low RI ranges.

    Main Methods:

    • Fabrication of MFBGs coated with a CNT layer.
    • Experimental measurement of the MFBG's reflection spectrum under varying surrounding refractive indices (SRIs).

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    Last Updated: Mar 15, 2026

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  • Analysis of spectral changes, specifically peak intensity and wavelength shifts, with increasing SRI.

    • Main Results:

    • The CNT-MFBG exhibited significant peak intensity attenuation with increasing SRI, while wavelength remained stable.
    • The sensor demonstrated high sensitivity in the low RI range (1.333-1.435).
    • Peak intensity sensitivity reached -53.4 dBm/refractive index unit, a 15-fold improvement over uncoated MFBGs.

    Conclusions:

    • CNT modification significantly enhances the sensitivity of MFBG-based RI sensors, particularly in low RI regions.
    • The CNT-induced evanescent field enhancement is key to the improved sensing performance.
    • The reflective MFBG probe with CNT modification shows strong potential for biochemical sensing applications.