Surface Acoustic Wave Focusing and Induced Rayleigh Waves

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Abstract
We introduce a new method for observing the anisotropic propagation of surface acoustic waves on solids. Point source and point detection of ultrasonic waves, scanned as a function of propagation angle, give the group velocities and intensities of Rayleigh and pseudosurface waves. Group-velocity focusing and internal diffraction are observed for Si, and a new Rayleigh mode, induced by water loading of the surface, is discovered. Such effects are predicted for most anisotropic solids.