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

被引：270

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

页数：11

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