General expressions for the refractive indices of absorbing biaxial media as a function of the angle of incidence

Abstract

In this work we obtain general expressions for the complex refractive indices of refracted waves as a function of the angle of incidence in the case of an electromagnetic wave propagating in a transparent isotropic medium that reaches an interface with a biaxial absorbing medium. The biaxial absorbing medium is only required to have a diagonalizable complex dielectric tensor. Obtained expressions can be applied to any orientation of the principal axes and can be specialized for isotropic, uniaxial or biaxial, or transparent or absorbing media. By using these expressions we have also obtained the surface of indices and the surface of absorption coefficients for an example of a biaxial absorbing medium.

Optically anisotropic media: New approaches to the dielectric function, singular axes, microcavity modes and Raman scattering intensities

“…, E = 4.78 eV) the two optic axes from the transparency regime start to exhibit significant splitting into the four singular axes. ‘B’ denotes a range ( E ≈ 4.78–7.33 eV) of ”almost” uniaxial degeneracy close to the ‐direction. At two spectral points (points ‘C’, E = 8.14 eV and ‘D’, E = 8.37 eV) one pair of singular…”

“…Analytical solutions for orthorhombic and monoclinic crystals can be found in ; we point to previous discussions of the orientational dependence of the complex index of Refs. .…”