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arXiv 0812.2954cond-mat.mtrl-sci
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声学超材料中的负有效密度

Negative Effective Density in An Acoustic Metamaterial

Sam Hyeon Lee, Choon Mahn Park, Yong Mun Seo, Zhi Guo Wang, Chul Koo Kim

摘要:

我们报告了一种新型的负有效质量密度均匀化声学超材料的理论和实验结果。我们构建了一维的超材料,它是一个管子,里面放置了一系列非常薄的弹性膜。该结构在0 ~ 735 Hz的频率范围内表现出负的有效密度。实验结果与我们的理论模型预测的截止频率以下的负有效密度非常一致。该有效密度的频率特性类似于电磁等离子体振荡的介电常数。

英文摘要:

We report theoretical and experimental results for a new type of homogenized acoustic metamaterials with negative effective mass density. We constructed one-dimensional metamaterial, which is a tube with an array of very thin elastic membranes placed inside. This structure exhibited negative effective density in the frequency range from 0 to 735 Hz. The experimental result is in excellent agreement with our theoretical model that predicts negative effective density below a cut-off frequency. The frequency characteristics of this effective density is analogous to that of the permittivity of the electromagnetic plasma oscillation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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