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Research results of deep minima reflectance of terahertz (far-infrared) radiation one may observe experimentally in a number of crystalline media are firstly presented in the paper. Analysis of physical conditions for the almost complete disappearance of the electromagnetic waves reflection from the interface with crystal is given. We based on single oscillatory model of crystal and it allows us to...
Anisotropy effects on the negative dielectric permittivity (DP) formation in the frequency region near the phonon lattice vibrations are considered using three crystalline modifications of boron nitride. Quantitative data on frequency intervals and negative DP values are presented for all anisotropic modifications. It is shown that anomalous dispersion of the refractive index falls to 0 <...
Damping of the polar vibrations determines the real limits of negative dielectric permittivity (DP) region as shown in this work. We obtain the simple quantitative criterion for the negative DP existence in the single oscillatory approximation model. We introduce this criterion as inequality between the damping constant and T-L frequency splitting of the polar phonon. This inequality is the sufficient...
Terahertz anomalous dispersion and material physical properties leads to form the region with negative dielectric permittivity (DP) that is created around the polar frequency oscillations in three crystalline modifications of boron nitride will be analyzed in our report. Our analysis based on the simple quantitative criterion of existence the negative DP bands. Seven vibrations in different crystalline...
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