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Fiber SPR two-dimensional micro displacement sensor based on the coaxial double waveguide with a conical structure
Optics Express
|October 14, 2022
Summary
This study introduces a novel fiber surface plasmon resonance (SPR) sensor for two-dimensional micro displacement measurement. The innovative design enables precise detection in both x and y axes, overcoming previous limitations.
Area of Science:
- Optoelectronics
- Nanophotonics
- Sensor Technology
Background:
- Current fiber SPR sensors are limited to one-dimensional displacement sensing.
- A need exists for advanced sensors capable of two-dimensional micro displacement detection.
Purpose of the Study:
- To propose and demonstrate a fiber SPR two-dimensional micro displacement sensor.
- To achieve precise measurement of micro displacements in both x and y directions using a single fiber optic device.
Main Methods:
- Development of a fiber SPR sensor utilizing a coaxial double waveguide with a conical structure.
- Employing distinct light field modes (horn-shaped and straight beam) from the waveguide's cores for directional sensing.
- Integration of simulation analysis and experimental validation.
Main Results:
- The sensor successfully achieved two-dimensional micro displacement sensing based on SPR.
- Demonstrated average wavelength sensitivities of 0.0537 nm/µm (x-axis) and 0.315 nm/µm (y-axis).
- Achieved average light intensity sensitivities of 0.000124 a.u./µm (x-axis) and 0.00277 a.u./µm (y-axis).
Conclusions:
- The proposed fiber SPR sensor effectively enables two-dimensional micro displacement measurement.
- This technology holds significant potential for applications in precision positioning and micro-displacement analysis.
