A new technique for excitation of surface and shear acoustic waves on nonpiezoelectric materials

1 May 1978

journal article
conference paper
Published by AIP Publishing in Applied Physics Letters

Vol. 32 (9) , 513-514
https://doi.org/10.1063/1.90138

Abstract

An interdigital transducer deposited on a piezoelectric substrate has been used to excite SAW on nonpiezoelectric materials by using a fluid couplant. The piezoelectric substrate is held at an angle to the nonpiezoelectric material so as to match the tangential k vectors of the surface waves. Experiments have been carried out with a LiNbO₃ piezoelectric substrate and a ceramic such as SiC or Si₃N₄ with a fluid couplant. At a center frequency of 100 MHz, the estimated conversion efficiency of the surface wave from the piezoelectric to the nonpiezoelectric material is −3.5 dB. The results compare favorably with a normal mode coupling theory we have developed which predicts −2.7 dB efficiency.

Keywords

This publication has 2 references indexed in Scilit:

A monolithic zinc-oxide-on-silicon convolver
Applied Physics Letters, 1974
Acoustic readout of charge storage on GaAs
Applied Physics Letters, 1974