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Fiber-tip polymer filled probe for high-sensitivity temperature sensing and polymer refractometers
Optics Express
|March 18, 2022
Summary
A novel polymer-based Fabry-Perot interferometer (FPI) offers a low-cost, simple fabrication method for refractive index sensing. Enhanced temperature sensitivity was achieved using the Vernier effect.
Area of Science:
- Optoelectronics and Photonics
- Materials Science
Background:
- Fabry-Perot interferometers (FPIs) are crucial optical sensing devices.
- Developing cost-effective and robust FPIs for material characterization is an ongoing challenge.
Purpose of the Study:
- To propose and demonstrate a compact and robust polymer-core Fabry-Perot interferometer.
- To investigate its suitability for refractive index measurement and enhanced temperature sensing.
Main Methods:
- Fabrication using low-cost techniques: fusion splicing and polymer injection.
- Polymer filling the entire capillary core for ease of demodulation.
- Experimental characterization of temperature sensitivity and application of the Vernier effect.
Main Results:
- Demonstrated a linear temperature sensitivity of 1226.64 pm/°C within a specific temperature range.
- Achieved significantly improved temperature sensitivity of -15.617 nm/°C by employing the Vernier effect.
- Validated the FPI as a platform for polymer refractive index measurement.
Conclusions:
- The proposed polymer-core FPI is a cost-effective and robust sensing platform.
- The structure facilitates easy demodulation and material property measurement.
- The enhanced sensitivity opens avenues for advanced sensor applications in polymer optical fibers.
