Phase-Matched Electromagnetic Generation and Detection of Surface Elastic Waves on Nonconducting Solids.

摘要

Surface elastic waves have been generated and detected at a fundamental frequency of 15.5 MHz on high-resistivity silicon. The generation process involved the Lorentz forces exerted by a static magnetic field on the current-carrying elements of an evaporated aluminum meander line whose spatial periodicity matched that of the surface waves. The detection process involved the motional emf induced by the magnetic field in the vibrating elements of the receiver meander line. The generation-detection signal amplitude shows a B squared dependence and is a maximum when the magnetic field is parallel to the direction of propagation.