Article
Article
Surface-acoustic-wave devices
Article By:
Branch, Darren W. Biosensor and Nanomaterials Department, Sandia National Laboratories, Albuquerque, New Mexico.
Last reviewed:January 2020
DOI:https://doi.org/10.1036/1097-8542.670600
Devices that employ surface acoustic waves in the analog processing of electronic signals in the frequency range 107–109 Hz. Surface acoustic waves are mechanical vibrations that propagate along the surfaces of solids. In 1885, Lord Rayleigh discovered a type of surface acoustic wave that contains both compressional and transverse components 90° out of phase with one another. Since that time, other types of surface acoustic waves have been discovered and are an active area of intense research. A few notable examples include a wave propagating along a layer on a surface (Love wave), a wave propagating along an interface between two solids (Stoneley wave), and transverse guided waves on solids (Bleustein-Gulyaev-Shimizu waves). Love waves are shear-horizontal (SH) waves that have displacement only in a direction perpendicular to the plane of propagation.
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