Pseudo surface acoustic waves inα-quartz

The paper analytically and numerically investigates the conditions of existing of a isolated surface wave, which is known as a pseudo surface wave (PSAW), on a free surface of α-quartz. It is shown that a large number of PSAW solutions exist on the nonsymmetrical crystal planes of the crystal. Piezoelectricity ofα-quartz converts the elastic pseudo surface waves to three partial piezoelectric PSAW on electrically shorted surface, while on electrically unshorted or a free surface they are leaky waves with expremelly small attenuation coefficients.