Spectral shifts and spectral switches of a polychromatic electromagnetic light wave on scattering from an anisotropic semisoft boundary medium are discussed. It is shown that both the property of the incident field and the character of the scattering medium play roles in the change of the spectrum of the far-zone scattered field. It is also shown that the distribution of the far-zone scattered spectrum, including the magnitude of the spectral shift and the direction at which the spectral switch occurs, is rotationally nonsymmetric.
The correlation between intensity fluctuations (CIF) of an electromagnetic scattered field generated by a particulate collection was studied. It is demonstrated that the normalized CIF in a scattered field can be decomposed into two mutually independent parts: one is governed by the polarization property of the incident field, called the polarization-induced CIF change; the other is governed by the structural characteristics of the scattering medium, which is called the scattering-induced CIF change. Two special particulate media—i.e. random-distributed particles collection and deterministic-distributed particles collection—were discussed to show the changes of the normalized CIF in the scattered field.
A model of anisotropic quasi-homogeneous media with adjustable boundaries is presented with the help of the three-dimensional multi-Gaussian function. After that, the behaviors of the far-zone field of light waves on scattering from an anisotropic semisoft-boundary quasi-homogeneous medium are illustrated. It is shown that the spectral density of the scattered field is flattened-Gaussian-centered, owing to the semisoft boundary of the scatterer, while the spectral degree of coherence is Gaussian-centered, which is independent of the boundary of scatterer. It is also shown that both the spectral density and the spectral degree of coherence are anisotropic because of the anisotropy of the scattering medium.
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