Propagation of acoustic waves in a metamaterial with a refractive index of near zero
Propagation of acoustic waves in a metamaterial with a refractive index of near zero
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DOI：
10.1063/1.4811742
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发表时间：
2013-06-17
影响因子：
4
通讯作者：
Lee, Sang Hun
中科院分区：
文献类型：
--
作者：
Park, Choon Mahn;Lee, Sang Hun
实现了声波折射率接近于零的超材料系统。利用等效电路理论对采用亥姆霍兹谐振器的系统进行了分析。通过模拟和实验，我们观察到超材料中有很大的相速度，并且在与超材料直接耦合的窄法向波导中有能量密度的集中。这与超材料对于电磁波的作用不同，因为电磁波的能量密度集中在超材料内部。声学超材料系统可应用于声能集中器和声滤器装置的研制。(C)2013 AIP出版有限责任公司。
A metamaterial system with a refractive index of near zero for acoustic wave is realized. The designed system, which uses Helmholtz resonators, is analyzed using the equivalent circuit theory. Through the simulation and the experiment, we observed a large phase velocity in the metamaterial and a concentration of the energy density in the narrow normal waveguide directly coupled to the metamaterial. This is different to the metamaterial for the electromagnetic wave, because the concentration of energy density of the electromagnetic wave occurs in the metamaterial inside. The acoustic metamaterial system can be applied to the development of device for the acoustic energy concentrator and the acoustic filter. (C) 2013 AIP Publishing LLC.