Negative-dynamic-mass response without localized resonance

Negative-dynamic-mass response without localized resonance
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无局部共振的负动态质量响应

DOI:
10.1209/0295-5075/91/54004
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发表时间:
2010-09
期刊:
EPL
影响因子:
1.8
通讯作者:
Liu, Zhengyou
Liu, Zhengyou
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Cheng, Liang;Xiao, Meng;Deng, Ke;Qiu, Chunyin;He, Zhaojian;Liu, Zhengyou

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我们提出了一种新机制来实现负动态质量响应。该系统由一块浸有水的软实心板组成,上面有周期性的重型光栅。负动态质量源于薄板中耦合声表面波的集体激发,而不是像通常那样源于局部共振。进一步应用简单的弹簧质量模型来理解这种奇异现象。可以预见新机制的广泛应用,例如设计具有负折射率的声学超材料。
We propose a new mechanism to achieve negative-dynamic-mass response. The system consists of a water-immersed soft solid plate patterned with periodical heavy gratings. The negative dynamic mass stems from collective excitations of the coupled acoustic surface waves in the thin plate, but not from local resonances as usual. A simple spring-mass model is further applied to understand this exotic phenomenon. Extensive applications of the new mechanism can be anticipated, such as in designing acoustic metamaterials with negative indices.
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影响因子: 1.6
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