期刊
PHYSICS LETTERS A
卷 379, 期 36, 页码 2097-2101出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2015.05.037
关键词
-
资金
- National Natural Science Foundation of China [11274121]
We show in the paper that a two-dimensional acoustic metamaterial with isotropic negative refraction band at subwavelength scale can be constructed simply by arranging only one kind of Helmholtz resonators into honeycomb-like lattice. To understand the phenomenon, the mechanism for double negative metamaterial is investigated. We point out that double negative metamaterials can be obtained only when the phase accumulating over their constructive unit cell becomes greater than pi but smaller than 2 pi. Based on the understanding, we attribute the negative refraction phenomenon in our suggested structure as a result of the band folding effect. (C) 2015 Elsevier B.V. All rights reserved.
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