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Teflon-coated microfiber resonator with weak temperature dependence.

Ye Chen1, Fei Xu, Yan-Qing Lu

  • 1College of Engineering and Applied Sciences and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.

Optics Express
|November 24, 2011
PubMed
Summary

A novel microfiber coil resonator (MCR) uses Teflon to achieve temperature insensitivity. This fiber optic sensor demonstrates a low temperature dependence of less than 6pm/°C, ideal for precise measurements.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Sensor Technology

Background:

  • Microfiber coil resonators (MCRs) are sensitive to temperature fluctuations.
  • The thermo-optic effect in silica and surrounding materials influences MCR performance.
  • Controlling microfiber dimensions is crucial for mitigating temperature dependence.

Purpose of the Study:

  • To demonstrate a temperature-insensitive MCR.
  • To investigate the effect of microfiber size on temperature dependence.
  • To achieve stable optical sensing performance across varying temperatures.

Main Methods:

  • Fabricating a three-turn MCR using a ~3μm-diameter microfiber.
  • Embedding the MCR in Teflon, a material with an opposite thermo-optic coefficient.

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  • Characterizing the MCR's spectral shift in response to temperature changes.

    • Main Results:

    • The developed MCR exhibits a low temperature dependence of less than 6pm/°C.
    • The temperature dependence is significantly compensated by embedding the MCR in Teflon.
    • Microfiber diameter critically influences the balance between silica and polymer thermal effects.

    Conclusions:

    • Embedding MCRs in materials with opposing thermo-optic coefficients effectively suppresses temperature dependence.
    • Optimizing microfiber radius offers a pathway for further enhancing temperature stability in MCRs.
    • This approach enables robust optical fiber sensing applications requiring high thermal stability.