Character of Surface Plasmons in Layered Spherical Structures

Abstract—This article discusses the effect of geometry on the surface plasmon resonances. The static dielectric polarizability of a sphere suffers a singularity when its permittivity relative to the surroundings is −2. This well-known resonance condition is changed when the shape of the particle is no longer a sphere. In this article the character of the resonances is studied, with a particular emphasis on a two-layer sphere. 1.