Effects of physical constants of viscoelastic liquid on leaky surface acoustic waves propagating on layered structures

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Abstract
Effects of the physical constants of a viscoelastic liquid on leaky surface acoustic waves (LSAWS) propagating on liquid/piezoelectric film/glass structures are studied theoretically. It is found that the radiation loss is very much affected by the change in the physical constants of the liquid, and that it increases with increasing density, bulk modulus of elasticity and viscosity coefficient of the liquid. On the contrary, it slightly decreases with increasing permittivity. All the physical constants of glycerin act to increase the radiation loss compared with the case of water and hence the maximum loss for glycerin/ZnO/Pyrex glass structures is 66% larger than that for water loading.