  The periodically poled ferroelectric wafer is a two-dimensional phononic
superlattice. The important applications of such a solid include novel
ultrasonic transducers at the micro/nano-scale for low intensity
ultra-sonography, ferroelectric data storage, and development of very high
frequency chips for next generation communication and information technologies,
and others. Usually, the transformations between the electrical and mechanical
energies are required in the applications. In this work, we find the frequency
characteristics for an effective acousto-electric interaction in a
two-dimensional phononic superlattice inserted in LiNbO3 wafer.
