Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China.
Phys Rev Lett. 2010 Aug 13;105(7):074301. doi: 10.1103/PhysRevLett.105.074301.
We report both experimentally and theoretically that enhanced acoustic transmission can occur in the subwavelength region through a thin but stiff structured plate without any opening. This exotic acoustic phenomenon is essentially distinct from the previous related studies originated from, either collectively or individually, the interaction of the incident wave with openings in previous structures. It is attributed to the structure-induced resonant excitation of the nonleaky Lamb modes that exist intrinsically in the uniform elastic plate. Our finding should have an impact on ultrasonic applications.
我们通过实验和理论同时证明，通过一块薄而硬的结构板可以在亚波长区域实现增强的声波传输，而无需任何开口。这种奇特的声学现象与之前的相关研究截然不同，之前的研究要么源于入射波与之前结构中的开口的相互作用，要么源于其单独作用。它归因于结构诱导的非泄漏兰姆模式的共振激发，而这种模式在均匀弹性板中固有存在。我们的发现应该会对超声波应用产生影响。
