Symmetry effects on elastic wedge waves at anisotropic edges
Symmetry effects on elastic wedge waves at anisotropic edges
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DOI：
10.1063/1.4884837
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发表时间：
2014-06
影响因子：
3.2
通讯作者：
P. D. Pupyrev;A. Lomonosov;P. Hess;A. Mayer
中科院分区：
文献类型：
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作者：
P. D. Pupyrev;A. Lomonosov;P. Hess;A. Mayer
采用激光操作的角度可调换能器来激发沿固体楔形顶点引导的选择性弹性波。用光学检测方法研究了楔形波在具有不同对称性的各向异性单晶硅边缘上的传播。与各向同性介质相比，晶体中对称性的降低导致了许多新的特征，例如超音速漏楔波的存在，倾斜的空间脉冲剖面以及它们定位的其他特性。给出了三种不同类型的对称结构的实验和理论结果：楔形对称的中平面，楔形对称的顶点线的垂直平面，以及楔形对称的一个面。实验包括相速度和波场分布的精确测量，为楔形波的局部化和与其他波的耦合提供了信息。理论上，楔形波可以用拉盖尔函数来处理。
A laser-operated, angle-tunable transducer was employed to excite selectively elastic waves guided along the apex of a solid wedge. The propagation of wedge waves at anisotropic monocrystalline silicon edges with different symmetry properties was studied by optical detection. The reduced symmetry in crystals, as compared to isotropic media, causes a number of new features, such as the existence of supersonic leaky wedge waves, tilted spatial pulse profiles, and other peculiarities of their localization. Experimental and theoretical results are presented for three different types of symmetry configurations: the wedge symmetric about its midplane, the wedge symmetric about the plane normal to its apex line, and the wedge symmetric about one of its faces. The experiments include accurate measurements of the phase velocity and the wave field distribution, providing information on localization and coupling of wedge waves with other waves. Theoretically, the wedge waves were treated by the Laguerre function met...