Optical Resonances in Reflectivity near Crystal Modes with Spatial Dispersion

Details Optical Resonances in Reflectivity near Crystal Modes with Spatial Dispersion Optical Resonances in Reflectivity near Crystal Modes with Spatial Dispersion

2003-03-11

arxiv.org/abs/physics/0303046v2

Physics

Optics

4 pages, 7 eps figures, minor changes

Scientific paper

10.1103/PhysRevB.68.012302

We study the effect of spatial dispersion of crystal modes on optical properties such as the reflectivity $R$. As an example for isotropic media, we investigate the simplest model for phonons in ionic crystals and compare with previous results for highly anisotropic plasmons, which are now understood from a more general point of view. As a consequence of the wave vector dependence of the dielectric function small changes in the lineshape are predicted. Beyond that, if the frequency of minimal $R$ is near a pole of the dispersionless dielectric function, the relative amplitude of dips in $R$ with normal and anomalous dispersion differ significantly, if dissipation and disorder are low.

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