Double-negative acoustic metamaterial
Double-negative acoustic metamaterial
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DOI：
10.1103/physreve.70.055602
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发表时间：
2004-11-01
影响因子：
2.4
通讯作者：
Chan, CT
中科院分区：
文献类型：
--
作者：
Li, J;Chan, CT
我们在这里显示的声学超材料的存在，其中的有效密度和体积模量同时为负，在真正的和严格意义上的有效介质。我们的双负声学系统是电磁学中Veselago介质的声学模拟。并有许多独特的后果例如负折射率。声学中的双负性来自低频共振，如电磁学中的情况，但负密度和负模量来自单一共振结构，与电磁学不同，电磁学中的负磁导率和负介电常数来自不同的共振机制。
We show here the existence of acoustic metamaterial, in which both the effective density and bulk modulus are simultaneously negative, in the true and strict sense of an effective medium. Our double-negative acoustic system is an acoustic analogue of Veselago's medium in electromagnetism. and shares many unique consequences. such as negative refractive index. The double negativity in acoustics is derived from low-frequency resonances, as in the case of electromagnetism, but the negative density and modulus are derived from a single resonance structure as distinct from electromagnetism in which the negative permeability and negative perrmittivity originates from different resonance mechanisms.