Light scattering by ensemble of nonabsorbing correlated two-layered particles: specific feature for spectral dependence of extinction coefficient.

Scattering of light by an ensemble of nonabsorbing spherical concentric two-layered particles is considered. It has been shown that exponent of the power function describing the wavelength dependence of the extinction coefficient of the medium with subwavelength-sized particles can exceed considerably the value of 4, which takes place for the Rayleigh scattering. Spatial correlation of particles enhances this "anomalous" dependence on the wavelength. Bleaching and darkening effects can be implemented. In the first case transmittance increases, while in the second case transmittance decreases with increased volume concentration. These effects can be used to get a sharp spectral dependence of transmittance. Comparison with the data for spatially correlated homogeneous particles is carried out.