title: Application of semiclassical and geometrical optics theories to resonant modes of a coated sphere.
abstract: This work deals with some aspects of the resonant scattering of electromagnetic waves by a metallic sphere covered by a dielectric layer, in the weak-absorption approximation. We carry out a geometrical optics treatment of the scattering and develop semiclassical formulas to determine the positions and widths of the system resonances. In addition, we show that the mean lifetime of broad resonances is strongly dependent on the polarization of the incident light.
authors.affiliation: Departamento de Física Nuclear, Instituto de Fisica, Universidade Federal do Rio de Janeiro, CP 68528, 21945-970 Rio de Janeiro RJ, Brazil.
authors.forename: Túlio M
authors.initials: TM
authors.lastname: Bambino
authors.forename: Ana Maria S
authors.initials: AM
authors.lastname: Breitschaft
authors.forename: Valmar C
authors.initials: VC
authors.lastname: Barbosa
authors.forename: Luiz G
authors.initials: LG
authors.lastname: Guimarães