Modeling and numerical study of the electroacoustic behavior of lithium niobate under an initial electrical stress

Recently, we developed a second order formalism of piezoelectric structures under an external stress. In this work, this formalism is used to numerically study the nonlinearities and evolutions of electroacoustic behavior of lithium niobate under initial electrical stress. By varying the initial prestress, as well as azimuthal and elevation angles, the cut planes in which an electrical prestress induces significant changes on quasi-longitudinal velocity and benefits on coupling coefficient are identified.