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一种地震超材料:共振超楔体。

A seismic metamaterial: The resonant metawedge.

作者信息

Colombi Andrea, Colquitt Daniel, Roux Philippe, Guenneau Sebastien, Craster Richard V

机构信息

Dept. of Mathematics, Imperial College London, South Kensington Campus, London, UK.

Dept. of Mathematical Sciences, University of Liverpool, UK.

出版信息

Sci Rep. 2016 Jun 10;6:27717. doi: 10.1038/srep27717.

Abstract

Critical concepts from three different fields, elasticity, plasmonics and metamaterials, are brought together to design a metasurface at the geophysical scale, the resonant metawedge, to control seismic Rayleigh waves. Made of spatially graded vertical subwavelength resonators on an elastic substrate, the metawedge can either mode convert incident surface Rayleigh waves into bulk elastic shear waves or reflect the Rayleigh waves creating a "seismic rainbow" effect analogous to the optical rainbow for electromagnetic metasurfaces. Time-domain spectral element simulations demonstrate the broadband efficacy of the metawedge in mode conversion while an analytical model is developed to accurately describe and predict the seismic rainbow effect; allowing the metawedge to be designed without the need for extensive parametric studies and simulations. The efficiency of the resonant metawedge shows that large-scale mechanical metamaterials are feasible, will have application, and that the time is ripe for considering many optical devices in the seismic and geophysical context.

摘要

来自弹性力学、等离激元学和超材料这三个不同领域的关键概念被整合在一起,以设计一种地球物理尺度的超表面——共振超楔,用于控制地震瑞利波。超楔由弹性基底上空间渐变的垂直亚波长谐振器构成,它既可以将入射的表面瑞利波模式转换为体弹性剪切波,也可以反射瑞利波,产生一种“地震彩虹”效应,类似于电磁超表面的光学彩虹。时域谱元模拟证明了超楔在模式转换方面的宽带有效性,同时还开发了一个解析模型来准确描述和预测地震彩虹效应;这使得超楔的设计无需进行大量的参数研究和模拟。共振超楔的效率表明,大规模机械超材料是可行的,将会有应用前景,并且在地震和地球物理背景下考虑许多光学器件的时机已经成熟。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a7e1/4901369/591a0686c355/srep27717-f1.jpg

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