INVESTIGATION OF POSSIBILITIES OF ELLIPSOMETRIC DETERMINATION OF GYROTROPY PARAMETERS OF CRYSTALS OF MIDDLE SYNGONIES IN REFLECTED LIGHT

Abstract

The problem of light propagation in gyrotropic crystals with antisymmetric part of the gyration tensor is considered. The general solution of the equation \((1 - \tilde{\alpha}\varepsilon^{-1}\alpha + \vec{m}^{^{\times}}\varepsilon^{-1}\vec{m}^{^{\times}} + i\vec{\Gamma}^{^{\times}})\vec{H} = 0\) for the vector of the magnetic field of its own waves \(\vec{H}\) applicable to crystals of all syngonies is obtained. Crystals of the average and lower crystal systems with the tensor of gyration \(\alpha = \alpha_1 + \alpha_2(\vec{c},\vec{c}) + \alpha_0\vec{c}^{^{\times}}\) are considered. It is shown that for the average syngonies in a quasi-ordinary wave, if \(\vec{n}\) and \(\vec{c}\) are not orthogonal, there is always a component the magnet field along the propagation direction, whereas in a quasi-ordinary wave such component appears only in the presence of an asymmetric part of the tensor \(\alpha\). It is shown that gyrotropy of crystals of planal class of middle syngony manifests itself not only in ellipticity of the reflected light, but also in the additional phase jump of the reflected waves, especially near the Brewster angle. Gyrotropy of such crystals manifests itself the more noticeable the closer the refractive index of the environment to the refractive indices of the crystal. The calculations correct for a perfect crystal surface, but the transition layer can affect the ellipticity of the reflected light, jump phases and modules of the nondiagonal elements. The influence of the transition layer.