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Low-temperature sensitivity periodically tapered photonic crystal-fiber-based refractometer
Optics Letters
|October 2, 2013
Summary
This study introduces a simple, low-cost fiber optic sensor for measuring refractive index (RI). The photonic crystal fiber (PCF) sensor achieves high sensitivity and is less affected by temperature changes.
Area of Science:
- Optics and Photonics
- Fiber Optic Sensing
- Materials Science
Background:
- Refractive index (RI) sensing is crucial in various scientific and industrial applications.
- Existing fiber-optic sensors often face challenges related to complexity, cost, and sensitivity.
- Photonic Crystal Fibers (PCFs) offer unique light-guiding properties for advanced sensing applications.
Purpose of the Study:
- To propose and experimentally investigate a novel all-fiber refractometer based on periodically tapered PCF.
- To demonstrate the sensor's capability for accurate refractive index measurements.
- To evaluate the sensor's performance, including sensitivity and temperature cross-sensitivity.
Main Methods:
- Fabrication of a sensor head comprising a PCF sandwiched between standard single-mode fibers.
- Periodical tapering of the PCF using a CO(2) laser and a ZnSe cylindrical lens.
- Measurement of wavelength shifts in the transmission spectrum to determine RI changes.
Main Results:
- Achieved an average sensitivity of 222 nm/RIU over a RI range of 1.33 to 1.38.
- Demonstrated significantly reduced sensitivity to temperature variations.
- The sensor exhibits a simple configuration and low-cost fabrication.
Conclusions:
- The proposed periodically tapered PCF refractometer is a promising device for RI sensing.
- Its simplicity, low cost, and competitive sensitivity make it suitable for various applications.
- The reduced temperature sensitivity enhances its reliability in practical environments.
