title: Shape matters: plasmonic nanoparticle shape enhances interaction with dielectric substrate.
abstract: Numerical analyses of the ultraviolet and visible plasmonic spectra measured from hemispherical gallium nanostructures on dielectric substrates reveal that resonance frequencies are quite sensitive to illumination angle and polarization in a way that depends on nanostructure size, shape, and substrate. Large, polarization-dependent splittings arise from the broken symmetry of hemispherical gallium nanoparticles on sapphire substrates, inducing strong interactions with the substrate that depend sensitively on the angle of illumination and the nanoparticle diameter.
authors.affiliation: Grupo de Óptica, Departamento Física Aplicada, Universidad de Cantabria, 39005 Santander, Spain.
authors.forename: Pablo
authors.initials: P
authors.lastname: Albella
authors.forename: Borja
authors.initials: B
authors.lastname: Garcia-Cueto
authors.forename: Francisco
authors.initials: F
authors.lastname: González
authors.forename: Fernando
authors.initials: F
authors.lastname: Moreno
authors.forename: Pae C
authors.initials: PC
authors.lastname: Wu
authors.forename: Tong-Ho
authors.initials: TH
authors.lastname: Kim
authors.forename: April
authors.initials: A
authors.lastname: Brown
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.forename: Henry O
authors.initials: HO
authors.lastname: Everitt
authors.forename: Gorden
authors.initials: G
authors.lastname: Videen
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D005708:Gallium / Q000737:chemistry*; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D014466:Ultraviolet Rays
chemical_list: D005708:Gallium; D000537:Aluminum Oxide