声晶体中的非线性自准直声束
Nonlinear self-collimated sound beams in sonic crystals
摘要：
本文研究了高强度声束在自准直或减小发散条件下在声波晶体中的传播。介质是具有弹性二次非线性的流体，其中主要的非线性效应是谐波产生。讨论了有效产生窄光束、无发散二次谐波的条件。数值模拟与分析预测一致，调制介质中的线性色散特性和相位匹配条件下的二次介质中的非线性相互作用的基础上。
英文摘要：
We report the propagation of high-intensity sound beams in a sonic crystal, under self-collimation or reduced-divergence conditions. The medium is a fluid with elastic quadratic nonlinearity, where the dominating nonlinear effect is harmonic generation. The conditions for the efficient generation of narrow, non-diverging beam of second harmonic are discussed. Numerical simulations are in agreement with the analytical predictions made, based on the linear dispersion characteristics in modulated media and the nonlinear interaction in a quadratic medium under phase matching conditions.
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