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Fano resonances in symmetric plasmonic split-ring/ring dimer nanostructures.
Applied Optics
|November 2, 2019
Summary
Symmetric split-ring/ring dimer nanostructures exhibit tunable Fano resonances due to bonding mode switching. These plasmonic nanostructures show potential for high-performance optical sensing applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical Spectroscopy
Background:
- Fano resonances in nanostructures are crucial for sensing applications.
- Split-ring resonator (SRR) and ring resonator (RR) dimers are known for their tunable optical properties.
Purpose of the Study:
- To theoretically investigate the optical properties of symmetric split-ring/ring dimer (SRRD) nanostructures.
- To understand the origin of asymmetric Fano line shapes in SRRDs.
- To explore the potential of SRRDs as optical sensors.
Main Methods:
- Theoretical calculation of optical properties for SRRD nanostructures.
- Analysis of spectral positions and intensity of Fano resonance.
- Investigation of the influence of geometric parameters on Fano resonance.
Main Results:
- Asymmetric Fano line shapes were observed and linked to fast switching of bonding modes between split-ring plasmon and ring dipole.
- The spectral positions and intensity of Fano resonance are tunable by adjusting the dimensions of the SRRD nanostructures.
- Geometric parameter variations allow for flexible adjustment of the asymmetric Fano line shape.
Conclusions:
- SRRD nanostructures exhibit tunable Fano resonances with adjustable line shapes.
- These nanostructures offer comparable sensing figures of merit to conventional nanoparticles.
- SRRDs are promising candidates for developing high-performance optical sensors.
