Scattering by a Small Object Close to an Interface. 3. Buried Object

摘要

Exact Image Theory (EIT) is applied to the problem of electromagnetic wavescattering from a small object below the interface separating two isotropic and homogeneous media. The object is assumed to be electrically small so that it can be approximated by an electric dipole with known dyadic polarizability. Scattering from a buried small dielectric sphere is considered as an example of the theory. The present work might help us to understand light scattering by solar system dust particles in planetary regoliths, for which the so-called opposition effect and negative linear polarization have been observed; that is, nonlinear brightening and reversal of linear polarization near the backscattering direction.