Abstract
The role of electromagnetic effects in the reflection and transmission of acoustic waves in piezoelectric materials is discussed. Attention is focused on the analysis of a number of situations where the coefficients of plane wave conversion derived on the basis of the electromagnetic theory differ significantly from the coefficients calculated within the frame of the quasi-electrostatic approximation. This effect occurs at quasi-normal incidence for angles of the order of v a/ v el, where v a and v el are the typical velocities of the sound and electromagnetic waves, respectively. For instance, according to the electromagnetic description, the acoustic wave must suffer total reflection while the quasi-electrostatic approximation predicts almost total transmission. The possibility of experimental observation of the above effects is also discussed.
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