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High Sensitivity Surface Plasmon Resonance Sensor Based on a Ge-Doped Defect and D-Shaped Microstructured Optical
Nilson H O Cunha1, José P Da Silva1
1Post-Graduated Program in Electrical and Computer Engineering, Technology Center, Federal University of Rio Grande do Norte, Natal 59078-970, Brazil.
Sensors (Basel, Switzerland)
|May 20, 2022
Summary
This study introduces a D-shaped microstructured optical fiber (MOF) plasmonic sensor for detecting a wide range of analyte refractive indices (RI). The sensor achieves high spectral sensitivity, up to 11,650.63 nm/RIU, for advanced sensing applications.
Area of Science:
- Photonics and Sensing Technologies
- Materials Science for Optical Devices
- Nanotechnology for Plasmonics
Background:
- Microstructured optical fibers (MOFs) offer unique light-confining properties for sensing.
- Plasmonic sensors utilize the interaction of light with metal nanoparticles to detect analytes.
- D-shaped fiber geometry enhances evanescent field interaction for improved sensing.
Purpose of the Study:
- To propose and numerically analyze a novel D-shaped MOF plasmonic sensor.
- To achieve high spectral sensitivity for a wide range of analyte refractive index (RI) detection.
- To investigate the impact of Germanium Dioxide (GeO2) doping on sensor performance.
Main Methods:
- Fabrication of a D-shaped MOF by polishing.
- Doping the silica (SiO2) core with Germanium Dioxide (GeO2) at varying concentrations.
- Deposition of a thin gold (Au) layer as the plasmonic material.
- Numerical simulation of the sensor's response to analyte RI variations.
Main Results:
- The sensor effectively detects analyte RI variations from 1.32 to 1.45.
- A wide RI detection range of 0.13 refractive index units (RIU) was achieved.
- The sensor demonstrated an average wavelength sensitivity (WS) of up to 11,650.63 nm/RIU.
- High spectral sensitivity was attributed to GeO2 doping and the D-shaped MOF design.
Conclusions:
- The proposed D-shaped MOF plasmonic sensor exhibits excellent performance for RI sensing.
- The sensor's high sensitivity and wide detection range make it suitable for diverse sensing applications.
- GeO2 doping is an effective strategy to enhance the spectral sensitivity of plasmonic MOF sensors.
