A theoretical analysis of a new BGS wave guide

The stress energy of the new elastic surface wave (BGS wave) found by Bleustein, Gulyaev and Shimizu is not well concentrated in the vicinity of the surface as compared to the Rayleigh wave, because the existence of the former depends solely on the piezoelectricity of the medium. In this paper, it is shown that by the introduction of the conductive layer of zero thickness in the piezoelectric medium, the stress energy can be concentrated between the free boundary and the conductive layer. It is also shown that the guiding structures developed in this manner have very weak dispersion and hence can be used as nondispersive delay lines. The analysis of such structures has been developed in this paper based on the formulation derived from the transmission line model for shear waves in the piezo-electric media.