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Shanshan Wang1, Jing Wang, Guoxiang Li

  • 1Optics and Optoelectronics Laboratory, Department of Physics, Ocean University of China, Qingdao, China. wangshanshan231@gmail.com

Applied Optics
|May 23, 2012
PubMed
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This study presents a theoretical model for silica microfiber loop resonators (MLRs) to sense seawater salinity and refractive index. Optimized MLRs show high sensitivity and a low detection limit for accurate, miniaturized seawater monitoring.

Area of Science:

  • Photonics and Optical Sensing
  • Materials Science
  • Environmental Monitoring

Background:

  • Optical microfiber loop resonators (MLRs) offer unique resonant and waveguiding properties.
  • Accurate sensing of seawater properties like refractive index (RI) and salinity is crucial for environmental monitoring.
  • Existing sensing technologies may lack the required sensitivity or miniaturization for certain applications.

Purpose of the Study:

  • To theoretically investigate the potential of silica MLRs for sensitive RI and salinity detection in seawater.
  • To analyze the influence of key parameters on the sensing performance of MLRs.
  • To establish a model for optimizing microscale fiber sensors for seawater analysis.

Main Methods:

  • Theoretical investigation of silica microfiber loop resonators (MLRs).

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  • Calculation of sensitivity and detection limits based on resonant and waveguiding properties.
  • Analysis of parameter dependencies including probing wavelength, fiber diameter, and ring diameter.

    • Main Results:

    • MLR sensitivity increases with probing wavelength and decreases with microfiber diameter.
    • Bending and absorption losses are critical factors influencing the detection limit.
    • Achieved theoretical RI sensitivity of 10(-6) RI units and salinity detection limit of 10(-2) ‰ (10 ppm) upon optimization.

    Conclusions:

    • Silica MLRs are a promising platform for highly sensitive, low-detection-limit seawater sensing.
    • The theoretical model provides a foundation for developing miniaturized, high-performance fiber optic sensors.
    • Optimized MLRs can significantly advance microscale seawater monitoring capabilities.