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Refractive Index Sensing Using Helical Broken-Circular-Symmetry Core Microstructured Optical Fiber.
Mingjie Cui1, Zhuo Wang2, Changyuan Yu1,3
1Department of Electronic and Information Engineering, Photonics Research Institute, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
Sensors (Basel, Switzerland)
|December 11, 2022
Summary
This study introduces a novel helical optical fiber for refractive index sensing. Its unique design guides light effectively, showing potential for advanced fiber sensing applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Helical twist in optical waveguides offers enhanced control over light propagation.
- Microstructured optical fibers (MOFs) are versatile platforms for sensing applications.
Purpose of the Study:
- To propose and investigate a helical broken-circular-symmetry core MOF for refractive index sensing.
- To analyze the modal characteristics and light guidance mechanisms influenced by helical twist and core offset.
Main Methods:
- Finite element modeling (FEM) was employed to simulate the fiber's optical properties.
- Transformation optics principles were used in conjunction with FEM for detailed analysis.
Main Results:
- Confinement loss behavior varies with twist rate and core offset, demonstrating a twist-induced light guidance mechanism.
- Resonant peaks were observed at specific twist rates due to mode couplings in the helical structure.
- The fiber exhibits promising refractive index sensing performance.
Conclusions:
- The proposed helical MOF with broken circular symmetry is a viable design for enhanced light control.
- The twist-induced guidance mechanism and observed resonant phenomena offer new avenues for sensor design.
- This fiber architecture holds significant potential for future fiber-based sensing technologies.
