Journal
NANO LETTERS
Volume 11, Issue 10, Pages 4475-4479Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202804y
Keywords
Fano resonance; surface plasmon; symmetry breaking; plasmon hybridization; nanodisk
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Funding
- National Basic Research Program of China [2007CB936800]
- National Natural Science Foundation of China [10574002, 61176120]
- Robert A. Welch Foundation [C-1220, C-1222]
- DoD Defense Threat Reduction Agency (DTRA)
- Office of Naval Research [N00244-09-1-0067]
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A wide variety of complex, multicomponent plasmonic nanostructures have been shown to possess Fano resonances. Here we introduce a remarkably simple planar nanostructure, a single metallic nanodisk with a missing wedge-shaped slice, that also supports a Fano resonance. In this geometry, the Fano line shape arises from the coupling between a hybridized plasmon resonance of the disk and a narrower quadrupolar mode supported by the edge of the missing wedge slice. As a consequence, both disk size and wedge angle control the properties of the resonance. A semianalytical description of plasmon hybridization proves useful for analyzing the resulting line shape.
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