Equivalence theorem of light waves on scattering from anisotropic media

A new equivalence theorem of light waves on scattering from anisotropic medium is discussed. Specifically, the far-zone spectral density of light waves scattered from Gaussian-correlated anisotropic medium is studied, and conditions for different aniostropic medium to produce identical spectral density distribution are presented. It is found that under some special conditions, far-zone scattered field with complete equivalence (i.e. three-dimensional equivalence theorem) or that with partial equivalence (i.e. two-dimensional equivalence theorem) can be realized. This phenomenon may play an important role in the inverse scattering problem.