title: Dispersion relation and radiation properties of plasmonic crystals with triangular lattices.
abstract: The optical properties of plasmonic crystals consisting of triangular lattices are theoretically investigated using rigorous coupled-wave analysis. Two types of structures were analyzed, one composed of an array of short cylindrical pillars on a flat metal surface and the other composed of an array of shallow cylindrical holes formed in a flat metal surface. The dispersion relations and radiation properties of the second and the third bands around the Γ point in the first Brillouin zone were investigated. We found these properties to be highly dependent on the radii of the cylindrical pillars and holes relative to the lattice constant. We also examined the influence on the dispersion relations and radiation properties of the deviation of the cross-section of the pillars and holes from a perfect circle.
authors.affiliation: RIKEN-The Institute of Physical and Chemical Research, Hirosawa, Wako, Saitama 351-0198, Japan. okamoto@riken.jp
authors.forename: Takayuki
authors.initials: T
authors.lastname: Okamoto
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kawata
mesh_terms: D003198:Computer Simulation; D003460:Crystallization; D008027:Light; D008962:Models, Theoretical; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*