The existence of two surface acoustic waves, the Rayleigh wave and the second leaky wave, on X-cut LiTaO3 has been detected using Brillouin scattering. Evidence of dispersion between ultrasonic and hypersonic velocities was found for both surface and bulk acoustic waves. Elastic constant values were determined from a simultaneous least-squares fit of the angular dispersion data for the longitudinal and the two transverse bulk acoustic modes.
The velocity angular dispersion of the generalized surface (GSW) and pseudosurface (PSW) acoustic waves on the (001) plane of InSb has been measured by Brillouin scattering. The complete range of angular dispersion of these waves on the (001) plane of an anisotropic cubic crystal has been experimentally determined. The p–p and p–s polarization results accord well with theory. In particular, the measured angular dispersion of these surface modes traces out two separate and distinct branches, in contrast to one single curve arising from the branching from GSW to PSW, normally observed for anisotropic cubic crystals.
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