Abstract
Surface plasmon resonances of an ellipsoid-ring nanostructure with spatial symmetry breaking have been investigated theoretically. In this plasmonic system, the multiple Fano resonances are enhanced and can be tuned effectively by rotating the nanoellipsoid in the cavity of the ring. It is demonstrated that such multiple Fano resonances result from the plasmon coupling between the bright mode of the nanoellipsoid and the dark mode of the nanoring. The dark octupolar and the bright octupolar Fano resonances can be excited by modifying the geometrical parameters of the nanostructure. The asymmetry also allows the generation of strong electric field enhancements in this nanostructure which can be applied in the surface-enhanced spectroscopy.
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Acknowledgments
The work was supported by the Fundamental Research Funds for the Central Universities (GK201002038) and Natural Science Basis Research Plan in Shaanxi Province of China (program no. 2011JQ1014).
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Zhao, K., Huo, Y., Liu, T. et al. Manipulation of Electrical Field Enhancements and Fano Resonances in Nanoellipsoid/Ring Plasmonic Cavities. Plasmonics 10, 1041–1048 (2015). https://doi.org/10.1007/s11468-015-9899-0
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DOI: https://doi.org/10.1007/s11468-015-9899-0