Abstract
The theory of Bobbert and Vlieger (Physica 137A (1986) 209) on light scattering from a spherical particle on a substrate is extended to light scattering from a spherical particle illuminated by an evanescent wave. Enhancement of the morphology dependent optical resonances of the particles for excitation by a plane wave as well as by an evanescent wave is investigated. Morphology dependent resonances are found to be attenuated, broadened, and shifted when the effect of the surface is considered. The properties of these resonances depend strongly on the distance of the particle to the surface as well as on the polarisation of the incident wave. It is also affected by the direction and type of the incident wave. Numerical results for the mode scattering cross-section are given for different refractive indices of the surface at various particle-to-surface distances.
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