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High-sensitivity coreless fiber surface plasmon resonance refractive index sensor based on Au/TiO2
Xiaohan Wang1, Hongyu Song1, Yanpei Xu1
1Northeastern University College of Sciences, Shenyang, Liaoning 110819, People's Republic of China.
Nanotechnology
|September 2, 2025
Summary
This study introduces a novel fiber optic surface plasmon resonance (SPR) sensor using a multi-mode fiber-coreless fiber-multimode fiber structure coated with Au/TiO2 nanofiber material. This enhanced SPR sensor demonstrates significantly improved sensitivity for high-performance refractive index sensing applications.
Area of Science:
- Photonics and Optical Sensing
- Nanomaterials Science
- Analytical Chemistry
Background:
- Fiber optic surface plasmon resonance (SPR) sensors are crucial for applications demanding high sensitivity.
- Existing SPR sensor designs face limitations in performance and versatility.
Purpose of the Study:
- To propose and characterize a novel SPR refractive index sensor based on a multi-mode fiber-coreless fiber-multimode fiber (MCM) structure.
- To enhance sensor performance through modification with Au/TiO2 nanofiber material.
Main Methods:
- Fabrication of a novel MCM fiber structure.
- Modification of the fiber structure with Au/TiO2 nanofiber material.
- Experimental characterization of the sensor's performance in a specific refractive index range.
Main Results:
- The Au/TiO2 nanofiber-modified SPR sensor achieved a sensitivity of 3687.65 nm/RIU.
- The sensor exhibited a high quality factor of 29.50 within the refractive index range of 1.333-1.380.
- The developed sensor demonstrated 2.05 times higher sensitivity compared to a sensor with an Au film structure.
Conclusions:
- The proposed MCM fiber SPR sensor modified with Au/TiO2 nanofiber material offers superior sensitivity and performance.
- This advanced sensor design holds significant potential for diverse applications including chemical sensing, safety detection, and medical diagnostics.
