Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces.
Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces.
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DOI：
10.1038/s41598-017-07151-6
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发表时间：
2017-07-28
影响因子：
4.6
通讯作者：
Craster RV
中科院分区：
文献类型：
--
作者：
Colombi A;Ageeva V;Smith RJ;Clare A;Patel R;Clark M;Colquitt D;Roux P;Guenneau S;Craster RV
近年来已经预示着引入超表面，其有利地将亚波长波操纵的视觉与与表面激发相关联的设计、制造和尺寸优势联合收割机组合。超颖表面中的一个重要课题是使用渐变超颖表面的电磁波和声波的定制彩虹捕获和选择性空间频率分离。这种频率相关的捕获和空间频率分离对能量集中器和相关的能量收集、感测和波滤波技术具有影响。声学和电磁彩虹设备的不同演示已经进行，但是不支持剪切波和压缩波，以及表面瑞利波的深层弹性基板;这些不仅允许瑞利波彩虹效应存在，而且允许从表面到剪切波的模式转换。在这里，我们实验证明不仅弹性瑞利波彩虹捕获，利用阻带表面波，但也选择性模式转换的表面瑞利波横波。在400-600 kHz范围内的超声波频率下进行的这些实验通过时域数值模拟来补充。我们设计的超表面并不局限于引导超声波，而是弹性波中的一种普遍现象，可以跨尺度平移。
Recent years have heralded the introduction of metasurfaces that advantageously combine the vision of sub-wavelength wave manipulation, with the design, fabrication and size advantages associated with surface excitation. An important topic within metasurfaces is the tailored rainbow trapping and selective spatial frequency separation of electromagnetic and acoustic waves using graded metasurfaces. This frequency dependent trapping and spatial frequency segregation has implications for energy concentrators and associated energy harvesting, sensing and wave filtering techniques. Different demonstrations of acoustic and electromagnetic rainbow devices have been performed, however not for deep elastic substrates that support both shear and compressional waves, together with surface Rayleigh waves; these allow not only for Rayleigh wave rainbow effects to exist but also for mode conversion from surface into shear waves. Here we demonstrate experimentally not only elastic Rayleigh wave rainbow trapping, by taking advantage of a stop-band for surface waves, but also selective mode conversion of surface Rayleigh waves to shear waves. These experiments performed at ultrasonic frequencies, in the range of 400–600 kHz, are complemented by time domain numerical simulations. The metasurfaces we design are not limited to guided ultrasonic waves and are a general phenomenon in elastic waves that can be translated across scales.
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影响因子：
5.3
作者：
Colquitt, D. J.;Colombi, A.;Guenneau, S. R. L.
通讯作者：
Guenneau, S. R. L.
亚波长声学超表面完全控制反射波的实验实现
影响因子：
4.6
作者：
Li, Yong;Jiang, Xue;Cheng, Jian-chun
通讯作者：
Cheng, Jian-chun
影响因子：
4
作者：
Kaina, Nadege;Lemoult, Fabrice;Lerosey, Geoffroy
通讯作者：
Lerosey, Geoffroy
影响因子：
2.4
作者：
Li, Dennis;Zigoneanu, Lucian;Cummer, Steven A.
通讯作者：
Cummer, Steven A.
影响因子：
4.7
作者：
PERKINS, NC;MOTE, CD
通讯作者：
MOTE, CD