Pulsed nonlinear surface acoustic waves in crystals.
R. E. Kumon, M. F. Hamilton (Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712-1063), Yu. A. Il'inskii, E. A. Zabolotskaya (MacroSonix Corporation, 1570 East Parham Road, Richmond, VA 23228), P. Hess (Institute of Physical Chemistry, University of Heidelberg, 69120 Heidelberg, Germany), A. M. Lomonosov, and V. G. Mikhalevich (General Physics Institute, Russian Academy of Sciences, 117942 Moscow, Russia).
A theoretical model developed recently for the propagation of nonlinear surface acoustic waves in crystals [Hamilton et al., Nonlinear Acoustics in Perspective, R. J. Wei, ed. (Nanjing University Press, Nanjing, 1996), pp. 64-69] is used to investigate transient effects associated with pulses. The present work extends an earlier numerical investigation of pulsed nonlinear Rayleigh waves in isotropic solids [Knight et al., JASA 96, 3322(A) (1994)]. The latter was verified via comparison with measurements of laser-generated nonlinear Rayleigh waves with shocks in fused quartz [Lomonosov et al., JASA 96, 3080(A) (1997)]. Here, simulations of waveform distortion and shock formation are presented for pulses in real crystals, including Si, KCl, and Ni, and for a variety of surface cuts and propagation directions. The second- and third-order elastic moduli in the nonlinearity matrix are taken from measurements reported in the literature. Attention is focused on waveforms corresponding to recent measurements of laser-generated nonlinear surface waves propagating in Si along the á112ñ direction of the (111) plane [Lomonosov and Hess, Nonlinear Acoustics in Perspective, pp. 106-111]. Preliminary comparisons of theory with measurements obtained in related experiments are in good agreement. [Work supported by ONR and the RFBR Foundation.]
Technical Area: Physical Acoustics (Nonlinear Acoustics)
(PACS) Subject Classification number(s): 43.25.Fe