Title :
The scattering of surface acoustic waves by electrical effects in two-dimensional metal film structures
Author :
Huang, F. ; Paige, E.G.S.
Author_Institution :
Dept. of Eng. Sci., Oxford Univ., UK
Abstract :
A theory is presented for the scattering of surface acoustic waves by electrical effects in thin metal films of arbitrary shape on the surface of a piezoelectric material. A Green´s function approach is used, and an expression for the two-dimensional Green´s function appropriate to the problem is given. General expressions are obtained for the far-field radiation pattern and for the response of an interdigital transducer to a single scatterer. Expressions for the reflection and velocity perturbation due to periodic arrays of scatterers are also presented. Good agreement is found when the theoretical predictions are compared with a wide range of experimental results on lithium niobate.<>
Keywords :
Green´s function methods; acoustic wave scattering; metallic thin films; piezoelectricity; surface acoustic waves; Green´s function; LiNbO/sub 3/; SAW; electrical effects; far-field radiation pattern; interdigital transducer; metal film structures; piezoelectric; scattering; surface acoustic waves; Acoustic scattering; Acoustic waves; Genetic expression; Green´s function methods; Piezoelectric films; Piezoelectric materials; Piezoelectric transducers; Reflection; Shape; Surface acoustic waves;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
