The theoretical analysis of stoneley waves propagating along an interface between Zno and glass

Conventional surface acoustic wave devices mainly use a Rayleigh wave, propagating along the surface of the substrate. Therefore, they require packaging. How—ever, the cost of packaging is high. Also, if the packaging quality is poor, water drops accumulate on the substrate surface at low temperature and the device may malfunction. This paper describes devices that do not require packaging and examine Stoneley waves, propagating along the interface between a piezoelectric ZnO layer, which can excite a surface wave, and a glass layer, in which material constants can be changed relatively easily. We find the range of the material constants of the glass which, in combination with ZnO, can generate Stoneley waves. We obtain the velocity, electromechanical coupling coefficient and energy concentration at the interface within this range. The effect of the material constants on these parameters is also considered. It is found that there are glasses that support Stoneley waves and others that do not.