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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Highly sensitive multi-core flat fiber surface plasmon resonance refractive index sensor.

Ahmmed A Rifat, G A Mahdiraji, Yong Meng Sua

    Optics Express
    |February 25, 2016
    PubMed
    Summary

    A novel multi-core flat fiber surface plasmon resonance (SPR) sensor offers high refractive index sensitivity. This SPR sensor, utilizing gold and titanium dioxide, achieves unprecedented wavelength interrogation sensitivity for advanced chemical and biochemical detection.

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    Area of Science:

    • Photonics and optical sensing technologies.
    • Nanomaterials and thin-film deposition.
    • Biomedical and environmental monitoring.

    Background:

    • Surface plasmon resonance (SPR) sensors are crucial for detecting changes in refractive index.
    • Fiber-based SPR sensors offer advantages in remote and in-situ measurements.
    • Existing fiber SPR sensors face limitations in sensitivity and detection range.

    Purpose of the Study:

    • To propose a novel multi-core flat fiber (MCFF) based SPR sensor.
    • To achieve high refractive index sensitivity using cost-effective materials.
    • To demonstrate potential for real-time remote sensing applications.

    Main Methods:

    • Utilizing a multi-core flat fiber (MCFF) platform.
    • Depositing chemically stable gold (Au) and titanium dioxide (TiO2) layers externally.
    • Operating the sensor at telecommunication wavelengths for signal interrogation.
    • Employing both wavelength and amplitude interrogation techniques.

    Main Results:

    • Achieved average wavelength interrogation sensitivity of 9,600 nm/RIU and maximum of 23,000 nm/RIU.
    • Demonstrated a refractive index resolution of 4.35 × 10⁻⁶.
    • Obtained maximum amplitude interrogation sensitivity of 820 RIU⁻¹ with a sensor resolution of 1.22 × 10⁻⁵ RIU.
    • Reported the highest wavelength interrogation sensitivity among fiber-based SPR sensors to date.

    Conclusions:

    • The proposed MCFF SPR sensor exhibits exceptional sensitivity and resolution.
    • The sensor design is simple, utilizing readily available materials.
    • This technology holds promise for inexpensive and accurate real-time chemical and biochemical sensing.