Abstract
The propagation of acoustic waves through a medium is associated with a simultaneous transfer of the wave momentum to any absorbing volume. The corresponding radiation force results in the generation of shear waves in this volume. To increase the absorption and thus to intensify the shear stresses, a sawtooth wave containing shocks can be used. This report presents experimental results on shear wave excitation in gelatin by a focused ultrasonic beam. Shear displacements are detected optically. It is shown that an increase of nonlinear waveform distortion and the formation of shocks result in a substantial enhancement of the shear wave excitation.
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