Behavior of Bleustein-Gulyaev Waves in a Periodically Corrugated Piezoelectric Crystal

The propagation characteristics of Bleustein-Gulyaev waves in a periodically corrugated piezoelectric crystal is investigated theoretically and numerically. The exact couple-mode equations governing the nature of Bleustein-Gulyaev wave interactions are derived with the aid of a singular perturbation procedure, and the interesting behavior of the filtering characteristics are shown numerically. It is found that the practically important characteristics such as wide stop-bandwidth and large wave-decay in the stopband can be achieved by choosing a value of the piezoelectric constant suitably, and/or coating the crystal surface with thin conducting material.