Nonreciprocal wave propagation and parametric amplification of bulk elastic waves in nonlinear anisotropic materials
Nonreciprocal wave propagation and parametric amplification of bulk elastic waves in nonlinear anisotropic materials
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DOI：
10.1088/1367-2630/ab61d9
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发表时间：
2020-02
影响因子：
3.3
通讯作者：
Mahsa Zakeri;S. Keller;Y. Wang;C. Lynch
中科院分区：
文献类型：
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作者：
Mahsa Zakeri;S. Keller;Y. Wang;C. Lynch
提出了弹性波的参数化放大和弹性波的框架，使新一代高性能、低噪声的声学放大器、混频器和环行器成为可能。使用一种新的方法与非线性材料产生非常理想的非互反特性。弱弹性信号波的参数放大是通过高强度的弹性泵浦波来实现的。通过对材料取向的精心选择以及对信号和泵浦波的精确激励，抑制了“上变频”，使弹性信号波在其原始频率上发生选择性放大。此外，本文还建立了一个通用的数学框架，用于非线性各向异性材料中耦合波动方程的分析研究。通过有限元计算验证了分析研究的结果。
Parametric amplification of an elastic wave and a framework for using elastic waves that could enable a new generation of high performance, low noise acoustic amplifiers, mixers and circulators are presented. Using a novel approach with nonlinear materials produces highly desirable non-reciprocal characteristics. Parametric amplification of a weak elastic signal wave is achieved by an elastic pump wave of higher intensity. By careful selection of material orientation together with precise excitation of signal and pump waves, ‘up frequency conversion’ is suppressed and selective amplification of the elastic signal wave occurs at its original frequency. In addition, a general mathematical framework is developed and used for analytical studies of coupled wave equations in nonlinear anisotropic materials. The results obtained from the analytical studies are verified using a finite element implementation.