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Highly Sensitive Graphene-Au Coated Plasmon Resonance PCF Sensor.
Hongyan Yang1,2, Mengyin Liu1, Yupeng Chen1
1School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541004, China.
Sensors (Basel, Switzerland)
|February 3, 2021
Summary
This study introduces a novel graphene-gold coated photonic crystal fiber sensor for enhanced biosensing. The design achieves high sensitivity and resolution for refractive index detection, paving the way for next-generation biosensors.
Area of Science:
- Photonics
- Nanomaterials Science
- Biosensor Technology
Background:
- Photonic Crystal Fibers (PCFs) offer unique light-confining properties.
- Surface Plasmon Polariton (SPP) propagation is sensitive to surrounding refractive index changes.
- Graphene-gold coatings can enhance biomolecule adsorption and SPP characteristics.
Purpose of the Study:
- To develop a highly sensitive biosensor based on a graphene-gold coated PCF.
- To investigate the impact of structural modifications on sensor performance.
- To achieve enhanced evanescent field interaction for improved sensing.
Main Methods:
- Fabrication of a D-shaped PCF with a side-polished defect.
- Coating the PCF defect with graphene and gold layers.
- Utilizing the Finite Element Method (FEM) for optical simulation and parameter optimization.
- Analysis of wavelength and amplitude sensitivity, and refractive index resolution.
Main Results:
- Optimized PCF geometry significantly improved sensing performance.
- Achieved maximum wavelength sensitivity of 4200 nm/RIU.
- Attained maximum amplitude sensitivity of 450 RIU-1.
- Demonstrated a refractive index resolution of 2.3 × 10-5 RIU within the 1.32-1.41 range.
Conclusions:
- The graphene-gold coated PCF sensor exhibits excellent sensitivity and resolution.
- The proposed sensor design is a promising platform for advanced biosensing applications.
- This work contributes to the development of new-generation, highly sensitive biosensors.
