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Highly Sensitive Twin Resonance Coupling Refractive Index Sensor Based on Gold- and MgF2-Coated Nano Metal Films
Kawsar Ahmed1, Mohammed A AlZain2, Hasan Abdullah1
1Group of Biophotomatiχ, Department of ICT, MBSTU, Tangail 1902, Bangladesh.
Biosensors
|April 30, 2021
Summary
A novel plasmonic material-coated fiber optic sensor demonstrates high sensitivity for refractive index (RI) detection. This advanced sensor shows great potential for next-generation biosensing applications.
Area of Science:
- Photonics
- Optical Sensing
- Materials Science
Background:
- Surface Plasmon Resonance (SPR) is a sensitive optical phenomenon used for detecting changes in refractive index.
- Photonic Crystal Fibers (PCFs) offer unique light-confining properties for advanced sensor designs.
- Plasmonic materials enhance SPR sensitivity for improved sensing performance.
Purpose of the Study:
- To propose and numerically investigate a plasmonic material-coated circular-shaped PCF (C-PCF) sensor.
- To explore the refractive index (RI) sensing performance in the 1.7-3.7 μm range.
- To optimize the sensor design for maximum sensing capabilities.
Main Methods:
- Utilized the Finite Element Method (FEM) for optical guiding analysis.
- Simulated a C-PCF structure coated with a nano-ring gold layer and magnesium fluoride (MgF2).
- Infiltrated liquid analytes into the outer air holes of the PCF cladding.
Main Results:
- Observed a twin resonance coupling profile.
- Achieved a maximum sensitivity of 27,958.49 nm/RIU.
- Demonstrated high resolution (3.70094 × 10-5 RIU) and a transmittance dip of -34 dB.
Conclusions:
- The optimized C-PCF sensor exhibits excellent RI sensing performance.
- The proposed sensor design is a promising candidate for future biosensing applications.
- The numerical simulation provides a foundation for potential experimental validation.
