Premium
On the Theory of Additional Light Waves and Boundary Conditions in Anisotropic Crystals
Author(s) -
Pekar S. I.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220820106
Subject(s) - polarization (electrochemistry) , anisotropy , physics , crystal (programming language) , boundary value problem , monochromatic color , uniaxial crystal , optics , exciton , electric field , reflection (computer programming) , condensed matter physics , chemistry , quantum mechanics , optical axis , lens (geology) , computer science , programming language
It is shown that the exciton contribution to the crystal polarization is not quite correctly separated in some papers. Therefore the additional boundary conditions derived there as well as formulas for the reflection coefficients are correct only if the waves in the crystal are strictly transversal. A general method is developed of separating the exciton contribution to the polarization for arbitrary angles between the wave vector and the electric field strength. The case of uniaxial crystals is considered in detail for the frequency region containing two near exciton transitions, both of them contributing to the dispersion. In this case the incident monochromatic ray generates in the crystal two ordinary rays and three nonordinary rays. The boundary conditions are derived for these rays. An expression is obtained for the light reflection coefficient of the crystal.