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

Xin Fang, Jihong Wen (), Bernard Bonello (), Jianfei Yin and Dianlong Yu
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Xin Fang: National University of Defense Technology
Jihong Wen: National University of Defense Technology
Bernard Bonello: Université Pierre et Marie Curie, (Box 840) 4
Jianfei Yin: National University of Defense Technology
Dianlong Yu: National University of Defense Technology

Nature Communications, 2017, vol. 8, issue 1, 1-11

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-00671-9

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