The quasi-static plasmonic problem for polyhedra

Abstract

We characterize the essential spectrum of the plasmonic problem for polyhedra in {mathbb {R}}^3. The description is particularly simple for convex polyhedra and permittivities epsilon < - 1. The plasmonic problem is interpreted as a spectral problem through a boundary integral operator, the direct value of the double layer potential, also known as the Neumann–Poincaré operator. We therefore study the spectral structure of the double layer potential for polyhedral cones and polyhedra.