Hybrid acoustic waves in thin potassium niobate plates

Abstract

The present article seeks to theoretically predict an effect and namely, the resonant interaction between fundamental acoustic modes propagating in a thin piezoelectric plate. It has been theoretically shown that for certain crystallographic cuts and propagation directions the electrical shorting of one of the strong piezoelectric plate sides may result in a coupling between fundamental acoustic modes. For example, the hybrid mode is generated for a frequency of about 10 MHz by an antisymmetric wave A0 and a shear-horizontal wave SH0, which propagate along the X+15° direction in a metallized Y-cut 100-μm-thick potassium niobate plate.