Space-time Variant Self-growing Bandgap in Nonlinear Acoustic Metamaterial
Abstract
Material band structure is key foundation for various modern technologies, but it was regarded as a space-time invariant feature. Acoustic metamaterials show extraordinary properties for processing elastic waves, but conventional realizations suffer from narrow bandgaps. Here we first report a nonlinear acoustic metamaterial whose band structure self-adapts to the propagation distance/time and the bandgap exhibits a self-growing behaviour stemming from giant nonlinear interaction. This space-time self-modulating characteristic highlights an unconventional understanding of the band structure, and the self-growth generates an ultralow and ultrabroad bandgap that breaks through the limitation of the mass law for linear locally resonant bandgaps. We also elucidate the self-adaptive mechanisms. This first demonstration sheds light on conceiving advanced devices and metamaterials with broadband, space-time variant bandgaps for wave self-manipulation.
Cite
@article{arxiv.1907.03062,
title = {Space-time Variant Self-growing Bandgap in Nonlinear Acoustic Metamaterial},
author = {Xin Fang and Jihong Wen and Dianlong Yu},
journal= {arXiv preprint arXiv:1907.03062},
year = {2020}
}