title: Plasmonic focusing in symmetry broken nanocorrals.
abstract: Plasmonic focusing was investigated in symmetry broken nanocorrals under linearly polarized illumination. Near-field optical measurements of the perpendicular electric field show that a single subwavelength spot size of 320 nm can be generated. The interference pattern within the corral can be controlled by changing the polarization of optical excitation and the degree of symmetry breaking. The intensity enhancement factor was investigated using finite-difference time-domain simulations and confirmed by analytical calculations taking into account the plasmon damping and multiple reflections against the corral wall.
authors.affiliation: School of Physics, State Key Laboratory for Mesoscopic Physics, Peking University, Beijing, China.
authors.forename: Zheyu
authors.initials: Z
authors.lastname: Fang
authors.forename: Qian
authors.initials: Q
authors.lastname: Peng
authors.forename: Wentao
authors.initials: W
authors.lastname: Song
authors.forename: Fenghuan
authors.initials: F
authors.lastname: Hao
authors.forename: Jia
authors.initials: J
authors.lastname: Wang
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Xing
authors.initials: X
authors.lastname: Zhu
mesh_terms: D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances