Semiclassical scattering of an electric dipole source inside a spherical particle

Semiclassical scattering phenomena appearing in the far-zone scattered inte nsity of a point source of electromagnetic radiation inside a spherical par ticle are examined in the context of both ray theory and wave theory, and t he evolution of the phenomena is studied as a function of source position. A number of semiclassical effects that do not occur for plane-wave scatteri ng by the sphere appear prominently for scattering by an interior source. T hese include a series of scattering resonances and a new family of rainbows in regions of otherwise total internal reflection. Diffractive effects acc ompanying the semiclassical phenomena are also examined. (C) 2001 Optical S ociety of America.