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Highly sensitive gas refractometers based on optical microfiber modal interferometers operating at dispersion turning
Optics Express
|November 25, 2018
Summary
This study presents a novel fiber-optic gas refractometer using a tapered microfiber modal interferometer. The device achieves exceptional refractive index sensitivity, overcoming limitations in traditional gas sensing.
Area of Science:
- Photonics
- Optical Sensing
- Fiber Optics
Background:
- Fiber-optic gas sensing is limited by refractive index (RI) mismatch.
- Developing high-sensitivity RI sensors is crucial for reliable remote gas detection.
Purpose of the Study:
- To report a highly sensitive gas refractometer.
- To investigate a tapered optical microfiber modal interferometer operating at the dispersion turning point (DTP).
Main Methods:
- Theoretical analysis of DTP conditions, spectral characteristics, and sensing performance.
- Experimental verification of ultrahigh RI sensitivity using a nonadiabatic tapered optical microfiber.
Main Results:
- Nonadiabatic tapered optical microfibers (1.8-2.4 µm diameter) exhibit DTPs in the near-infrared.
- Significant RI sensitivity enhancement observed around the DTPs.
- Experimental sensitivity achieved: -69984.3 ± 2363.3 nm/RIU.
Conclusions:
- The proposed gas refractometer demonstrates exceptional RI sensitivity.
- The DTP in tapered microfibers offers a promising mechanism for advanced gas sensing applications.
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