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

Nature Communications
Xin FangDianlong Yu

Abstract

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 (NAMs). 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 NAM 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.

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Citations

May 3, 2018·Scientific Reports·Jianfei YinLinfeng Yue
May 22, 2019·Physical Review. E·Weijian Jiao, Stefano Gonella
Dec 11, 2019·ACS Applied Materials & Interfaces·Zhandong HuangYanlin Song
Sep 3, 2021·The Journal of the Acoustical Society of America·Zhen-Ni LiYue-Sheng Wang

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