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Long-period grating refractive index sensor with a modified cladding structure for large operational range and high

Jian Yang1, Li Yang, Chang-Qing Xu

  • 1McMaster University, Hamilton, Ontario L8R 4K1, Canada. yangj22@mcmaster.ca

Applied Optics
|August 8, 2006
PubMed
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A novel long-period grating (LPG) refractive index sensor with a modified cladding structure expands the operational range by 31%. This enhanced sensor design offers improved sensitivity for refractive index detection.

Area of Science:

  • Photonics and Optical Sensing
  • Fiber Optic Sensors
  • Nanomaterials

Background:

  • Long-period gratings (LPGs) are widely used in optical sensing.
  • Existing LPG refractive index sensors face limitations in operational range and sensitivity.
  • Modified fiber cladding structures offer potential for sensor performance enhancement.

Purpose of the Study:

  • To propose and investigate a novel LPG refractive index sensor with a modified two-layer cladding structure.
  • To analyze the impact of cladding layer and overlay parameters on sensor sensitivity.
  • To determine design guidelines for optimizing the operational range and sensitivity of LPG sensors.

Main Methods:

  • Numerical modeling was employed to simulate the sensor's response to ambient refractive index changes.

Related Experiment Videos

  • The study systematically varied cladding layer radius and overlay refractive index.
  • Cladding mode behavior was analyzed as a function of structural parameters.

    • Main Results:

    • A two-layer cladding structure, comprising a low refractive index layer and a high refractive index overlay, was proposed.
    • Proper selection of overlay parameters induced field redistribution into the overlay with increasing ambient refractive index.
    • Reducing the cladding layer radius significantly increased the operational range to 0.195 (1.244-1.440), a 31% improvement.
    • A minimum sensitivity of 660 nm/refractive index was achieved.

    Conclusions:

    • The proposed modified cladding structure enhances the operational range and sensitivity of LPG refractive index sensors.
    • Reducing the cladding layer radius is a key design strategy for achieving a large operational range.
    • The findings provide valuable design guidelines for developing high-performance fiber optic refractive index sensors.