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Sensitivity-controllable refractive index sensor based on reflective θ-shaped microfiber resonator cooperated with
Zhilin Xu1,2,3, Yiyang Luo1, Deming Liu1
1School of Optical and Electronic Information, National Engineering Laboratory for Next Generation Internet Access System, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China.
Scientific Reports
|August 31, 2017
Summary
This study introduces a novel refractive index (RI) sensor using a θ-shaped microfiber resonator and Vernier effect. This all-fiber sensor offers tunable sensitivity for enhanced chemical and biological detection.
Area of Science:
- Photonics and Optical Sensing
- Fiber Optic Sensors
- Interferometry
Background:
- Refractive index (RI) sensing is crucial for chemical and biological analysis.
- Existing fiber optic sensors often lack tunable sensitivity.
- All-fiber devices offer advantages in miniaturization and robustness.
Purpose of the Study:
- To develop a sensitivity-controllable RI sensor.
- To enhance RI sensing sensitivity using the Vernier effect.
- To demonstrate tunable sensitivity through structural modification.
Main Methods:
- Utilizing a reflective θ-shaped microfiber resonator.
- Cascading the resonator with a fiber Fabry-Perot interferometer to generate Vernier effect.
- Adjusting the cavity length of the θ-shaped microfiber resonator to tune sensitivity.
Main Results:
- Theoretical analysis confirmed sensitivity enhancement by a factor 'm' due to Vernier effect.
- RI sensitivity was experimentally tuned from 311.77 nm/RIU to 2460.07 nm/RIU.
- Tunable sensitivity was achieved by adjusting the θ-shaped microfiber resonator's cavity length.
Conclusions:
- The developed all-fiber RI sensor provides controllable sensitivity and compact size.
- The sensor is suitable for diverse chemical and biological detection applications.
- The Vernier effect generation scheme offers a universal approach for enhancing optical fiber sensor sensitivity.
