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Implementation of a Reference Interferometer for Nanodetection
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Ultrasensitive optical sensing in aqueous solution based on microfiber modal interferometer.

Jing Wang, Yipeng Liao, Shanshan Wang

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    |November 25, 2018
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates ultrahigh sensitivity sensing in aqueous solutions using a microfiber modal interferometer (MMI). The novel sensor achieves a sensitivity of 14.95 pm/ppm for sodium nitrate, significantly outperforming existing naked sensors.

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    Area of Science:

    • Photonics
    • Optical Sensing
    • Interferometry

    Background:

    • Microfiber modal interferometers (MMI) offer potential for sensitive detection.
    • Achieving ultrahigh sensitivity in aqueous solutions remains a challenge for current MMI sensors.

    Purpose of the Study:

    • To realize ultrahigh sensitivity sensing in aqueous solution using a microfiber modal interferometer (MMI).
    • To investigate the relationship between group refractive index (RI) differences and sensing sensitivity.

    Main Methods:

    • Fabrication of MMIs with varying diameters.
    • Exploiting the zero group refractive index (RI) difference between HE11 and HE12 modes at specific wavelengths.
    • Utilizing infrared absorption bands in water (1360-1600nm) and adjusting microfiber diameter to avoid interference.
    • Experimental testing with sodium nitrate solutions at 1320nm.

    Main Results:

    • Achieved an ultrahigh sensitivity of 14.95 pm/ppm for sodium nitrate detection.
    • Demonstrated an equivalent sensitivity of approximately 1.26 × 10^5 nm/RIU for refractive index (RI) changes.
    • Observed that different MMI diameters correspond to unique ultrasensitive wavelength bands.
    • Successfully avoided water's infrared absorption band through microfiber diameter adjustment.

    Conclusions:

    • The developed MMI sensor exhibits significantly higher sensitivity compared to most existing naked sensors (10^2-10^4 nm/RIU).
    • The findings indicate a broad range of optional probing wavelengths and more flexible fabrication conditions for MMIs.
    • This technology holds promise for advanced aqueous solution sensing applications.