Electromagnetoacoustic surface waves on dispersive piezoelectric layered media Available to Purchase

A full electromagnetic approach is employed to study the propagation of SH surface waves on a piezoelectric solid layer superimposed on a piezoelectric solid substrate. The materials of the layered structure allow for dielectric dispersion and two different boundary conditions are considered at the free surface. The dispersion laws for both boundary conditions are derived in a general form and some special cases are discussed. The solutions of the dispersion equations reveal that besides the expected quasi-acoustic dispersive waves, new quasi-electromagnetic modes exist which propagate at high speeds and depths within the layered structure. These dispersive modes occur also in nondispersive materials. Moreover, in addition to subsonic quasi-acoustic modes, accounting for dielectric dispersion gives rise to quasi-acoustic surface modes whose speed exceeds the bulk wave speed of the layer. Special electroelastic surface waves are also discussed which are characterized by the absence of mechanical perturbation in the substrate.