PIEZOELECTRIC ACOUSTIC SURFACE WAVES FOR A FILM ON SUBSTRATE

Abstract

A computer program has been written for calculating the dispersion curves of acoustic waves for the film‐on‐substrate problem where both materials may be arbitrarily anisotropic and piezoelectric. The electromechanical coupling factor Δv/v is calculated for nonpiezo‐electric films on LiNbO₃ showing a marked increase over its value without the film. Velocity curves are shown for fused quartz on LiNbO₃, and Δv/v is shown for ZnO on a sapphire substrate predicting a maximum value of 0.019.