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Single-mode fiber curvature sensor based on SPR.

Yong Wei, Chunbiao Liu, Chunlan Liu

    Applied Optics
    |October 18, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel fiber optic curvature sensor utilizing surface plasmon resonance (SPR). The sensor demonstrates dual-parameter detection of curvature by monitoring changes in SPR resonance wavelength and valley depth, offering enhanced sensitivity and a narrow half-width.

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    Area of Science:

    • Optoelectronics
    • Fiber Optics
    • Nanotechnology

    Background:

    • Fiber optic sensors are crucial for high-sensitivity measurements.
    • Surface Plasmon Resonance (SPR) is typically used for refractive index sensing.
    • Curvature measurement using SPR in optical fibers remains underexplored.

    Purpose of the Study:

    • To design and fabricate a single-mode fiber curvature sensor based on SPR.
    • To investigate the dual-parameter sensing capabilities of the SPR fiber sensor.
    • To analyze the impact of fiber cutoff wavelength on sensor performance.

    Main Methods:

    • Fabrication of a single-mode fiber sensor with a 50 nm gold film coating.
    • Inducing Surface Plasmon Resonance (SPR) by bending the fiber and coupling light into the cladding.
    • Experimental analysis of SPR resonance wavelength and valley depth variations with curvature.
    • Investigating the effect of different single-mode fiber cutoff wavelengths.

    Main Results:

    • The sensor exhibits dual-parameter detection of curvature through changes in SPR resonance wavelength and valley depth.
    • Decreasing the fiber cutoff wavelength enhances valley depth sensitivity and reduces the half-height width (FWHM).
    • At a 630 nm cutoff wavelength, achieved sensitivities were 0.0088 a.u./m⁻¹ (valley depth) and 0.26 nm/m⁻¹ (wavelength), with an average FWHM of 21 nm.

    Conclusions:

    • The proposed SPR fiber sensor offers a narrow FWHM and an opening threshold for curvature detection.
    • Introducing a coreless fiber can enable threshold-free curvature detection.
    • This work presents a novel solution for diversified fiber SPR sensor applications.