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Surface Plasmon Resonance-Based Gold-Coated Hollow-Core Negative Curvature Optical Fiber Sensor.
1School of Electronics Engineering (SENSE), Vellore Institute of Technology, Chennai 600127, Tamil Nadu, India.
Biosensors
|February 25, 2023
Summary
A novel hollow-core negative-curvature fiber sensor utilizing surface plasmon resonance (SPR) offers high sensitivity for detecting refractive index changes. This plasmonic sensor achieves excellent performance, making it suitable for various sensing applications.
Area of Science:
- Photonics and Optical Sensing
- Nanotechnology
- Materials Science
Background:
- Hollow-core fiber sensors are attractive due to simple structures and low transmission loss.
- Surface Plasmon Resonance (SPR) is a sensitive detection technique.
- Negative-curvature fibers offer unique light-confining properties.
Purpose of the Study:
- To propose and investigate a novel hollow-core negative-curvature fiber (HC-NCF) sensor.
- To leverage SPR for enhanced refractive index (RI) sensing.
- To optimize the sensor design for high sensitivity and resolution.
Main Methods:
- Fabrication of an HC-NCF with a specific cladding structure (six circular silica tubes, two elliptical silica tubes).
- Coating the inner wall with gold as the plasmonic material.
- Numerical simulation using the finite element method (FEM) for performance analysis.
Main Results:
- Achieved maximum wavelength sensitivity of 6000 nm/RIU.
- Obtained a high resolution of 2.5 × 10-5 RIU.
- Reported a figure of merit (FOM) of 2000 RIU-1 (Y-polarization) and 857.1 RIU-1 (X-polarization).
Conclusions:
- The proposed HC-NCF SPR sensor demonstrates high sensitivity, resolution, and FOM.
- Its simple design and excellent performance make it a promising candidate for chemical, temperature, and biosensing applications.
