Abstract
The acoustoelectric admittance Y of the ZX-cut periodically poled LiNbO3 plate is investigated experimentally and theoretically computed. The sample consists of 88 inversely poled domains of 0.45 mm-long each. The vector voltmeter, digital oscilloscope, and function generator were used to measure the frequency dependencies Y(F) at room temperature. Double peaks were observed in the admittance measurements near the lower edge of a stop-band at frequencies 3.268 MHz and 3.287 MHz. Another double peak exists near upper edge of the acoustic stop band at frequencies 3.651 MHz and 3.663 MHz. The double peak in Y can be explained as follows. Ultrasound in this ferroelectric acoustic metamaterial (FAM) has a so-called stop band when an acoustic wavelength is close to a double-length of ferroelectric domain within the inversely poled structure. The dispersion curves computed by the finite element method reveal an effect of decoupling of two acoustic displacements in a zero-antisymmetric mode. The two displacements Ax and Az along the X and Z axes become decoupled near the boundaries of the acoustic Brillouin zone. This can be explained by different diffraction losses in two orthogonal displacements within the FAM. Computations are in a good agreement with experiments.
Published Version
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