Abstract
This chapter provides an overview of electrodynamics of media with spatial dispersion. It discusses some effects of spatial dispersion in crystal optics. The chapter describes the general problems of the electrodynamics of media with spatial dispersion and also a few effects of spatial dispersion in optics. Spatial dispersion occurs as the induction D in some point r is determined by the electromagnetic fields E and B in the same point and also in the vicinity of that point. In a gyrotropic medium, at least one direction must exist that is not equivalent to the directly opposite direction. Only a medium without a centre of symmetry can be gyrotropic. In the optics of practically nonabsorbing or weakly absorbing crystals, the spatial dispersion is weak in that sense that its magnitude is determined by the small parameter. In an arbitrary optically anisotropic medium and for an arbitrary direction of propagation of light, the appearance of resonance lines is not connected with the resonance growth of the components of ɛ ij (ε, k).
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