Numerical study of a near-zero-index acoustic metamaterial
Numerical study of a near-zero-index acoustic metamaterial
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DOI：
10.1016/j.physleta.2012.08.057
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发表时间：
2012-10-01
影响因子：
2.6
通讯作者：
Fang, Nicholas X.
中科院分区：
文献类型：
--
作者：
Jing, Yun;Xu, Jun;Fang, Nicholas X.
这封信研究了一个二维的，基于膜的声学超材料与近零折射率。它产生了一个频率依赖的有效密度，在以其第一谐振频率为中心的窄频带处接近于零。这种有效密度导致其折射率接近零。数值模拟表明，在这种超材料的相位发生微小的变化，超材料的功能作为一个角度过滤器，只有一个波的入射角接近零可以传输。在这封信中还讨论了它调整声学相位图的能力。(C)2012 Elsevier B.V.保留所有权利。
This Letter studies a two-dimensional, membrane-based acoustic metamaterial with a near-zero refractive index. It yields a frequency-dependent effective density that is near-zero at a narrow frequency band centered around its first resonant frequency. This effective density results in its near-zero refractive index. Numerical simulations are shown which demonstrate that the phase in this metamaterial undergoes small changes, and the metamaterial functions as an angular filter such that only a wave with a near-zero incident angle can transmit. Its ability to tailor acoustic phase pattern is also discussed in this Letter. (C) 2012 Elsevier B.V. All rights reserved.