title: Dispersion shifts in optical nanowires with thin dielectric coatings.
abstract: Based on exact solutions of Maxwell's equations of a 3-layer-structured cylindrical waveguide, we calculated dispersion shifts in thin-dielectric-coated optical nanowires. Typical parameters of silica and silicon nanowires are used for numerical simulations. It shows that, the dispersion of a nanowire waveguide can be made highly sensitive to the thickness and index of the coating layer, and a thin coat may lead to considerable dispersion shift of the guided light. For example, in a 300-nm-diameter silicon nanowire, a 1% decrease in diameter of the silicon core by oxidation of silicon into silica shell leads to a 34% decrease in dispersion at 1450-nm wavelength. Results presented in this work suggest the possibility of tuning waveguide dispersions of optical nanowires by coating thin dielectric layers.
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China.
authors.forename: Jingyi
authors.initials: J
authors.lastname: Lou
authors.forename: Limin
authors.initials: L
authors.lastname: Tong
authors.forename: Zhizhen
authors.initials: Z
authors.lastname: Ye
mesh_terms: D006801:Humans; D008027:Light; D008422:Materials Testing; D008962:Models, Theoretical; D049329:Nanostructures / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D055100:Optical Fibers