Photon and phonon velocity operators in dispersive crystals

Some particular examples of velocity operators in absorbing and excited crystals having dielectric, magnetic, and elastic anisotropy and frequency dispersion are considered. Expressions for the velocities of polarized normal waves are given in the vector form for any directions of phase normals. These expressions are valid for geometric analysis of velocities in the case of continuous or discrete changes in the sets of 3D propagation directions and the sets of initial polarizations of bulk waves and wave beams in crystals.     

Shear Surface Acoustic Waves in Twinned Piezoelectric Crystals of the $$\bar {6}$$m2 Symmetry Class

Crystallography Reports - Shear surface acoustic waves, whose existence is due to the difference in the signs of piezoelectric modulus tensors of adjoining halves of crystal, are studied on flat...     

Resonance excitation of polaritons by bulk electromagnetic waves in the layered systems with anisotropic substrates

The possible resonance excitation of surface electromagnetic waves by the bulk waves at the interface between a positive transparent uniaxial crystal and an isotropic medium has been predicted. The existence of the surface waves is provided by anisotropy of one of the boundary media. The tensor relation between the vector amplitudes of an exciting bulk electromagnetic wave and the excited surface wave is established. The ratio of the moduli of the tangential components of these amplitudes is analyzed as a function of the angle of incidence and the polarization of the bulk wave. The numerical calculations are performed for the surface waves at the interface between paratellurite TeO₂ and a KRS-6 (TlBr 30%-TlCl 70%) crystal.     

Surface electromagnetic waves in Faraday media

The effect of unidirectional propagation of surface electromagnetic waves on the interface between an isotropic Faraday medium and isotropic optically inactive medium is predicted. Such waves can be excited when the intensity of an external magnetic field exceeds a certain threshold. Solutions to the dispersion relation are analyzed, and existence conditions for the surface waves are established.     

Fedorov lateral shift at the interface between left-handed and right-handed media

The Fedorov lateral shift of a polarized beam upon the total internal reflection of light from an interface between media with positive and negative refractive indices is investigated. It is shown that the Fedorov lateral shift depends substantially on the polarization of the incident beam. The prediction is made that the Fedorov lateral shift can be completely compensated upon the total internal reflection of linearly polarized modes from two boundaries of a planar waveguide with a substrate prepared from a left-handed material.     

Debye Temperature for Materials with Arbitrary Anisotropy As a Function of the Series of Elastic Moduli

Crystallography Reports - A compact approximation of an expression for an averaged sum of reciprocal cubed phase velocities of elastic waves, which determines the Debye temperature at 0 K in terms...     

Dispersionless surface polaritons at twist boundaries of crystals and in a transition layer between the crystals

Dispersionless surface polaritons at twist boundaries of transparent uniaxial crystals are investigated. Exact analytical expressions for the central angles of the sectors of propagation of the surface polaritons are derived for arbitrary degrees of crystalline anisotropy η = ε_‖/ε_⊥ ? 1. The character of the change in the propagation sectors is determined with due regard for the isotropic transition layer between the crystals.