title: Removing a wedge from a metallic nanodisk reveals a fano resonance.
abstract: 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.
authors.affiliation: School of Physics, State Key Lab for Mesoscopic Physics, Peking University , Beijing 100871, China.
authors.forename: Zheyu
authors.initials: Z
authors.lastname: Fang
authors.forename: Junyi
authors.initials: J
authors.lastname: Cai
authors.forename: Zhongbo
authors.initials: Z
authors.lastname: Yan
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Naomi J
authors.initials: NJ
authors.lastname: Halas
authors.forename: Xing
authors.initials: X
authors.lastname: Zhu