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Fano resonance in dual-disk ring plasmonic nanostructures
Lifang Niu1, Jing Bo Zhang, Yuan Hsing Fu
1Data Storage Institute, Agency for Science, Technology and Research 5 Engineering Dr 1, off Kent Ridge Crescent, National University of Singapore, 117608, Singapore.
Optics Express
|November 24, 2011
Summary
Researchers developed a novel dual-disk ring (DDR) nanostructure for Fano resonance. This silver nanostructure shows promise for sensitive biochemical sensing applications in the visible spectrum.
Area of Science:
- Plasmonics and Nanophotonics
- Materials Science
- Biochemical Sensing
Background:
- Fano resonance in plasmonic nanostructures offers sharp spectral features desirable for sensing.
- Achieving Fano resonance typically requires broken symmetry and low-loss materials.
- Silver is a suitable plasmonic material for visible wavelength applications.
Purpose of the Study:
- To propose and investigate a novel dual-disk ring (DDR) nanostructure.
- To achieve Fano resonance in the visible wavelength range using the DDR structure.
- To evaluate the potential of DDR nanostructures as biochemical sensors.
Main Methods:
- Design and simulation of a DDR structure with broken symmetry using silver.
- Interpretation of Fano resonance excitation via coupling of plasmonic modes.
- Fabrication of DDR nanostructure arrays and experimental validation.
Main Results:
- Successful demonstration of Fano resonance in the visible spectrum for silver DDR nanostructures.
- Observation of the characteristic Fano resonance peak in extinction spectra.
- Evaluation of the figure of merit (FOM) for sensing applications.
Conclusions:
- The proposed DDR structure effectively generates Fano resonance in the visible range.
- Fabricated DDR nanostructures confirm simulation predictions.
- DDR nanostructures hold significant potential for highly sensitive biochemical sensing.
