Acoustic metamaterial with negative density

被引：359

作者：

Lee, Sam Hyeon ^{[1
]}

Park, Choon Mahn ^{[2
]}

Seo, Yong Mun ^{[3
]}

Wang, Zhi Guo ^{[4
]}

Kim, Chul Koo ^{[1
]}

机构：

[1] Yonsei Univ, Inst Phys & Appl Phys, Seoul 120749, South Korea

[2] Anyang Univ, AEE Ctr, Anyang 430714, South Korea

[3] Myongji Univ, Dept Phys, Yongin 449728, South Korea

[4] Tongji Univ, Dept Phys, Shanghai 200092, Peoples R China

来源：

PHYSICS LETTERS A | 2009年 / 373卷 / 48期

基金：

新加坡国家研究基金会;

关键词：

Acoustic metamaterial; Negative effective density; Membrane;

D O I：

10.1016/j.physleta.2009.10.013

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We fabricated a one-dimensional acoustic Metamaterial with negative effective density using an array of very thin elastic membranes. We observed acoustic equivalence of the plasma oscillation at omega(C) = 735 Hz. The metamaterial was opaque in the frequency range from 0 to 735 Hz, and was transparent above 735 Hz. We report direct observation of negative acceleration in this acoustic medium below 735 Hz. The frequency characteristics of the metamaterial have the same form as that of metals with negative permittivity. We also provide a simple theory to explain the experimental results. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：4464 / 4469

页数：6

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