Fano Resonances in Individual Coherent Plasmonic Nanocavities
Nano Letters2009Vol. 9(4), pp. 1663–1667
Citations Over TimeTop 1% of 2009 papers
Niels Verellen, Yannick Sonnefraud, Heidar Sobhani, Hao Feng, Victor V. Moshchalkov, Pol Van Dorpe, Peter Nordlander, Stefan A. Maier
Abstract
We observe the appearance of Fano resonances in the optical response of plasmonic nanocavities due to the coherent coupling between their superradiant and subradiant plasmon modes. Two reduced-symmetry nanostructures probed via confocal spectroscopy, a dolmen-style slab arrangement and a ring/disk dimer, clearly exhibit the strong polarization and geometry dependence expected for this behavior at the individual nanostructure level, confirmed by full-field electrodynamic analysis of each structure. In each case, multiple Fano resonances occur as structure size is increased.
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