在频域有限差分法使用上，我们用边界条件去处理金属和介质之间的边界，故能精确模拟出金属表面电浆波在近场的分布情形。
We match the boundary conditions to take care of the interface between the metal and the dielectric in the FDFD method. Thus the SP wave distribution on the metal surface can be accurately simulated.
对于压电晶体，不仅表面力源，而且表面电源分布也能激发弹性波场。
For the piezoelectric crystal, not only a mechanical source distribution at the surface, but an electrical source distribution also can excite the elastic wave fields.
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