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Experimental demonstration of sharp Fano resonance within binary gold nanodisk array through lattice coupling effects
Optics Letters
|December 23, 2014
Summary
Investigating Fano resonance in gold nanodisk arrays revealed that adjusting particle radii enhances the Q factor and spectral contrast. This finding is promising for developing advanced refractive sensors.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical metamaterials
Background:
- Fano resonance arises from the interaction between anti-phased and in-phased lattice collective resonances.
- Binary gold nanodisk arrays support these coupled resonances, influencing optical properties.
Purpose of the Study:
- To investigate Fano resonance in binary gold nanodisk arrays.
- To explore the relationship between particle radii, resonance properties, and potential sensing applications.
Main Methods:
- Numerical simulations were performed to model the optical response.
- Experimental measurements were conducted on fabricated gold nanodisk arrays.
- Systematic variation of particle radii in the arrays was employed.
Main Results:
- Increasing particle radii magnitude led to a higher Q factor and reduced spectral contrast.
- Experimental results achieved a spectral contrast of 0.7 and a Q factor of 14.
- Optimal calculations predicted a Q factor of 85 and a spectral contrast of 0.86.
- High sensitivity (337 nm/RIU) and figure of merit (116) were demonstrated.
Conclusions:
- Simultaneous achievement of high spectral contrast and Q factor is possible.
- The observed Fano resonance is highly promising for refractive index sensing applications.
- Weak near-field coupling facilitates the excitation of pure dipole resonances, enhancing sensor performance.
