Negative Effective Density in An Acoustic Metamaterial
Materials Science
2009-11-30 v3
Abstract
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.
Keywords
Cite
@article{arxiv.0812.2954,
title = {Negative Effective Density in An Acoustic Metamaterial},
author = {Sam Hyeon Lee and Choon Mahn Park and Yong Mun Seo and Zhi Guo Wang and Chul Koo Kim},
journal= {arXiv preprint arXiv:0812.2954},
year = {2009}
}