By Arthur A. Oliner, Eric A. Ash, G.W. Farnell, H.M. Gerard, A.A. Oliner, A.J. Slobodnik Jr., H.I. Smith
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Extra resources for Acoustic Surface Waves
17]; thus, the free surface is perpendicular to the basal plane of Fig. 5 and contains a cubic axis and the  direction. For propagation in the various directions in this plane, there are again SH, SV, and longitudinally polarized bulk waves ; the velocities for the SH waves are shown on Fig. 7. The small squares indicate that the SH wave 30 G. W. Farnell satisfies the free surface boundary conditions for propagation along the cubic axis and along the  direction. Note that in Fig. 5, the latter bulk wave was labelled SV with respect to the basal plane.
In this plane for crystals with r/< 1, there is variation of velocity with direction but it is not very dramatic. For propagation along , that is, at 45 ° to the cubic axis on these crystals with r/< 1, the sagittal-plane is again a mirror plane and thus the surface wave contains only two components, and the behavior is much the same as met on the cubic axis. The presence of two sagittal-plane components only is indicated by the symbol ® on this and subsequent velocity diagrams. Another difference from isotropic characteristics is introduced for general propagation directions on the basal plane because all three components of displacement are involved, and while the displacement ellipse at any depth again has one major axis perpendicular to the free surface, the other axis is not in the sagittal-plane.
The wave is similar to the "leaky" waves containing a radiating component met in certain electromagnetic boundary cases and with elastic surface waves if the small acoustic radiation loss into the air above the substrate is included. However, since in the case under discussion the phase match between tile tilted radiating wave and the surface wave is permitted only because of the anisotropic nature of the substrate, the term "pseudo surface wave" used in Fig. 5 appears to be more appropriate. 2 (110) Plane of Cubic Crystals It will be recalled that we are using propagation on principal planes of cubic crystals to illustrate most of the different second-order surface wave phenomena which can be encountered when the substrate is anisotropic.
Acoustic Surface Waves by Arthur A. Oliner, Eric A. Ash, G.W. Farnell, H.M. Gerard, A.A. Oliner, A.J. Slobodnik Jr., H.I. Smith