Caustic and anticaustic points in the phonon focusing patterns of cubic crystals.
Phonon focusing patterns are dependent on the existence of concave/saddle regions and acoustic axes in the slowness surface. The main feature of the focusing patterns in cubic crystals can be characterized by the caustic and anticaustic points in the symmetry planes. By applying the Stroh formalism, the caustic and anticaustic points in the symmetry planes are investigated in relation to degeneracies in the Stroh eigenvalue equation. A set of analytical expressions for the locations of the caustic and anticaustic points is derived for cubic crystals.
Wang
Litian
L
Ostfold University College, 1757 Halden, Ostfold 1757 Norway. litian.wang@hiof.no
D000162:Acoustics; D016880:Anisotropy; D002424:Caustics; D003461:Crystallography; D004548:Elasticity; D008958:Models, Molecular; D008962:Models, Theoretical
D002424:Caustics