Angular dependence of absorbance on the polarization angle of an IR beam in liquid crystals

The angular dependence of the IR absorption on the polarization angle is studied using a model based on IR dichroism and it is found to be modified by the anisotropy in the IR absorbances. This is obtained from the rotation of the electric field acting at a particular point in a liquid crystal with respect to that of the incident beam. The angular rotation is found to depend mainly on the distance of this point from the plane of incidence and the IR dichroism of the liquid crystal and less on the anisotropy in refractive indices.