Extinction and small angle scattering by thin plate crystals

In the framework of the physical optics method, we performed a numerical study of the energy and polarization characteristics of the optical radiation, transmitted through the semitransparent plate crystal. It is found that the dependence of the energy characteristic of the field, scattered in the near-forward direction, on the particle physical parameters is most substantial for the scattering angle not exceeding 4 degrees, and for IR wavelengths. It is shown that for certain combinations of the particle physical parameters, the off-diagonal elements of the extinction matrix and scattering matrix differ from the first elements of the respective matrices within 1 order of magnitude.