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Nonlinear Coupling of Surface and Quasitransverse Bulk Modes in Cubic Crystals

Published

Author(s)

R E. Kumon, M F. Hamilton

Abstract

In some propagation directions in crystals, the speed of the surfaceacoustic wave mode may approach that of the lowest speed quasitransverse bulk mode. Under these circumstances, it is possible for energy to be transferred from the surface to the bulk mode by nonlinear coupling. In the present paper we investigate the possibilities for mode coupling in the (001), (110), and (111) planes of cubic crystals. A condition is given for determining the range of propagation directions with significant coupling, and numericalresults are provided for eight different crystals with a range ofanisotropy ratios. It is shown that even for significant excitationamplitudes the coupling is negligible for most propagation directionsin the aforementioned surface cuts.
Citation
Journal of the Acoustical Society of America

Keywords

anisotropy, finite-amplitude, mode coupling, nonlinear, quasitransverse bulk wave, surface acoustic wave

Citation

Kumon, R. and Hamilton, M. (2008), Nonlinear Coupling of Surface and Quasitransverse Bulk Modes in Cubic Crystals, Journal of the Acoustical Society of America (Accessed February 26, 2024)
Created October 16, 2008