Abstract
Peculiarities of the non-local responses of spatially inhomogeneous insulating media toelectromagnetic waves are considered within a phenomenological approach. In thecase of a weak spatial dispersion (SD), a ‘quasi-local’ constitutive equation isderived, which allows one to isolate the effects of SD in relation to non-uniformitiesof the wavefield and the material properties of the medium. The symmetry ofthe material tensors is clarified. The material contribution to the SD suggests anovel mechanism for optical activity. The SD in crystalline media is described interms of dielectric permittivity dependent upon a single argument which is aspecific combination of the light wavevector and the reciprocal lattice vectors. Theconditions and materials for which the relevant effects can be notable are pointed out.The character of the normal light wave polarization in dielectric crystals of theA2BX4 group with incommensurately modulated superstructure is analysed and the effectivecrystal optical parameters are derived. It is shown that the first-order material SD effectsassociated with the bulk macroscopic properties of these crystals could be of practicalimportance.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
