Extinction analysis of dielectric multilayer microspheres

摘要

This letter reports optical properties of spherical dielectric particles with alternating layers of high and low refractive indices. The authors "predesigned" and synthesized polymer microspheres with alternating polystyrene and poly(trifluoroethyl methacrylate) layers of various thicknesses. Extinction of the microspheres was examined in a broad spectral range. A multipole expansion of electromagnetic field was applied for calculating the extinction efficiency of the particles. Excellent agreement was obtained between experimental and theoretical extinction curves.