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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
Published on: January 7, 2019
High-sensitivity four-layer polymer fiber-optic evanescent wave sensor
Xin Xin1, Nianbing Zhong1, Qiang Liao2
1Chongqing Key Laboratory of Fiber Optic Sensor and Photodetector, Chongqing Key Laboratory of Modern Photoelectric Detection Technology and Instrument, Chongqing Energy Internet Engineering Center, Chongqing University of Technology, Chongqing 400054, China.
A novel four-layer D-shaped fiber-optic evanescent wave (FOEW) sensor demonstrates high sensitivity for detecting antibodies. This enhanced FOEW sensor design offers significant improvements over conventional methods for various diagnostic applications.
Area of Science:
- Optoelectronics
- Biosensing
- Materials Science
Background:
- Fiber-optic evanescent wave (FOEW) sensors are crucial for sensitive detection.
- Conventional sensor designs often face limitations in sensitivity and background noise.
Purpose of the Study:
- To develop a novel four-layer D-shaped FOEW sensor with enhanced sensitivity.
- To investigate the impact of structural and material properties on sensor performance.
Main Methods:
- Fabrication of a four-layer D-shaped fiber structure with a light-absorbing film.
- Characterization of layer morphologies, refractive indices (RIs), and composition.
- Analysis of the effects of layer thicknesses and RIs on light transmission and sensitivity.
Main Results:
- The proposed FOEW sensor achieved a sensitivity of -0.077 (μg/l)⁻¹ for antibody detection.
- Sensitivity was 7.60 and 1.52 times higher than conventional and three-layer FOEW sensors, respectively.
- Optimization of layer properties significantly improved light transmission and sensitivity.
Conclusions:
- The novel four-layer D-shaped FOEW sensor exhibits superior sensitivity.
- This technology holds potential for applications in biodefense, disease diagnosis, and biochemical analysis.
