期刊
JOURNAL OF APPLIED PHYSICS
卷 115, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4864135
关键词
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资金
- National Natural Science Foundation of China [11174234, 51272215]
- National Key Scientific Program of China [2012CB921503]
We design a resonant meta-atom cluster, via which a two-dimensional (2D) acoustic metamaterial (AM) with broadband negative effective mass density from 1560 Hz to 5580 Hz is fabricated. Experimental results confirm that there is only weak interaction among the meta-atoms in the cluster. And then the meta-atoms in the cluster independently resonate, resulting in the cluster becoming equivalent to a broadband resonance unit. Extracted effective refractive indices from reflection and transmission measurements of the 2D AM appear to be negative from 1500 Hz to 5480 Hz. The broadband negative refraction has also been demonstrated by our further experiments. We expect that this meta-atom cluster AM will significantly contribute to the design of broadband negative effective mass density AM. (C) 2014 AIP Publishing LLC.
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