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A Large Detection-Range Plasmonic Sensor Based on An H-Shaped Photonic Crystal Fiber
Haixia Han1, Donglian Hou1, Lei Zhao1
1Tianjin Key Laboratory of Electronic Materials and Devices, School of Electronics and Information Engineering, Hebei University of Technology, Tianjin 300401, China.
Sensors (Basel, Switzerland)
|February 20, 2020
Summary
This study introduces a novel H-shaped photonic crystal fiber surface plasmon resonance sensor. It offers high sensitivity for detecting a wide refractive index range, demonstrating excellent stability and reusability.
Area of Science:
- Photonics
- Optical Sensing
- Nanotechnology
Background:
- Surface plasmon resonance (SPR) sensors are crucial for detecting changes in refractive index.
- Existing SPR sensor designs often face limitations in refractive index (RI) range and fabrication complexity.
- Photonic crystal fibers (PCFs) offer unique light-confining properties for sensor development.
Purpose of the Study:
- To propose and investigate an H-shaped PCF-based SPR sensor for a large RI detection range.
- To evaluate the sensor's sensitivity, stability, and reusability.
- To demonstrate a simplified fabrication approach for SPR sensors.
Main Methods:
- Utilizing an H-shaped photonic crystal fiber (PCF) with gold-film-coated grooves as sensing channels.
- Employing the finite element method (FEM) for numerical simulation and performance analysis.
- Investigating sensor performance across a broad analyte RI range (1.33 to 1.49).
Main Results:
- The proposed sensor successfully operates within a large analyte RI range (1.33-1.49).
- Maximum sensitivity achieved is 25,900 nm/RIU in the RI range of 1.47-1.48.
- The sensor demonstrates good stability with a 10% tolerance in gold-film thickness.
Conclusions:
- The H-shaped PCF-based SPR sensor provides a sensitive and versatile platform for RI sensing.
- The design offers simplified fabrication and reusability, overcoming limitations of conventional sensors.
- This sensor shows significant potential for various applications requiring broad-range refractive index detection.
