SPECTRAL-LINES OF SYMMETRICALLY SHAPED PARTICLES OR CLUSTERS WITH INTERNAL DISORDER

We have investigated the spectral properties of light scattering by small dielectric spheres whose resonant modes are perturbed by disordered static scatterers placed inside. We show that: (a) A narrow peak in the scattering spectrum, which is associated with a highly degenerate Mie resonance with a surface mode, can be broadened into a nearly semicircular curve. (b) Two such adjacent peaks can become overlapping, and the resulting curve differs from the linear superposition of the two curves. (c) The scattering cross section of a resonant mode can be increased by several orders of magnitude.