Abstract
Publisher Summary This chapter focuses on crystal optics with spatial dispersion. The theoretical development of crystal optics of electrodynamics devoted to the propagation of light in crystals. The longitudinal waves will get a group velocity different from zero only if one takes spatial dispersion into account. The angle between the group velocity vector and the wave vector can be larger. Crystal optics with spatial dispersion accounts for a whole series of new effects and peculiarities with respect to classical crystal optics. The microscopic approach to crystal optics on the present level is closely associated with the theory of excitons, in which spatial dispersion is an organic and quite essential element. The phenomenological approach of crystal optics develops crystal optics on the basis of spatial dispersion before going over to classical crystal optics.
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