Ultra-low and ultra-broad-band nonlinear acoustic metamaterials

被引：213
|
作者：
Fang, Xin [1 ]
Wen, Jihong [1 ]
Bonello, Bernard [2 ]
Yin, Jianfei [1 ]
Yu, Dianlong [1 ]
机构：
[1] Natl Univ Def Technol, Lab Sci & Technol Integrated Logist Support, Changsha 410073, Hunan, Peoples R China
[2] Univ Paris 06, Inst NanoSci Paris, INSP UMR CNRS 7588, Box 840,4 Pl Jussieu, F-75252 Paris 05, France
来源：
NATURE COMMUNICATIONS | 2017年 / 8卷
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1038/s41467-017-00671-9
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Linear acoustic metamaterials (LAMs) are widely used to manipulate sound; however, it is challenging to obtain bandgaps with a generalized width (ratio of the bandgap width to its start frequency) >1 through linear mechanisms. Here we adopt both theoretical and experimental approaches to describe the nonlinear chaotic mechanism in both one-dimensional (1D) and two-dimensional (2D) nonlinear acoustic metamaterials. This mechanism enables NAMs to reduce wave transmissions by as much as 20-40 dB in an ultra-low and ultra-broad band that consists of bandgaps and chaotic bands. With subwavelength cells, the generalized width reaches 21 in a 1D NAMs and it goes up to 39 in a 2D NAM, which overcomes the bandwidth limit for wave suppression in current LAMs. This work enables further progress in elucidating the dynamics of NAMs and opens new avenues in double-ultra acoustic manipulation.
引用
收藏
页数：11
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