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All-Opto Plasmonic-Controlled Bulk and Surface Sensitivity Analysis of a Paired Nano-Structured Antenna with a
Sneha Verma1, Souvik Ghosh1, B M A Rahman1
1School of Mathematics, Computer Science and Engineering, University of London, London EC1V 0HB, UK.
Sensors (Basel, Switzerland)
|September 28, 2021
Summary
This study presents a novel gold nanostructure sensor for highly sensitive real-time refractive index (RI) detection. Optimized elliptical nanoantennas achieve significant bulk and surface sensing capabilities, advancing plasmonic nanosensing technology.
Area of Science:
- Plasmonics
- Nanotechnology
- Biosensing
Background:
- Gold nanoantennas offer tunable optical and electronic properties for biomedical applications.
- Surface plasmon resonance (SPR) in nanostructures enables sensitive detection of environmental changes.
Purpose of the Study:
- To design and optimize a periodic paired gold nanostructure for enhanced refractive index (RI) detection.
- To investigate the sensing performance of single and paired gold nanostructured sensors for real-time RI monitoring.
Main Methods:
- Utilized surface plasmon resonance in periodic paired gold nanostructures.
- Optimized elliptical nanoantenna dimensions (major axis a, minor axis b, gap g, height h) for maximum sensitivity.
- Calculated bulk sensitivity, surface sensitivity, Full-Width at Half-Maximum (FWHM), and Figure-Of-Merit (FOM).
Main Results:
- An optimized elliptical nanoantenna (a=100 nm, b=10 nm, g=10 nm, h=40 nm) demonstrated high electric field confinement.
- Achieved a bulk sensitivity of 526-530 nm/RIU with an FWHM of ~110 nm and FOM of 8.1.
- Obtained a surface sensitivity of 250 nm/RIU for a 4.5 nm surface layer thickness.
Conclusions:
- The proposed paired gold nanostructure exhibits excellent potential for sensitive and real-time RI detection.
- The optimized nanoantenna design significantly enhances sensing performance, applicable in various refractive index sensing applications.
