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首页> 外文期刊>Mechanical systems and signal processing >Experimental demonstration of valley-protected backscattering suppression and interlayer topological transport for elastic wave in three-dimensional phononic crystals
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Experimental demonstration of valley-protected backscattering suppression and interlayer topological transport for elastic wave in three-dimensional phononic crystals

机译：基于三维声位晶体的弹性波的谷保护后散射抑制和层晶波的实验演示

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摘要

Topological insulator (TI) that possesses topologically protected characteristic of guiding the wave against disorders and structural perturbations without backscattering has attracted significant research interest in various fields including electromagnetic, acoustic and elastic system. However, for the mechanical system, realizing an elastic analogue of three-dimensional (3D) TI supporting the topologically protected wave propagation in two-dimensional (2D) plane is still a challenge due to the complicated mode polarization of elastic wave in 3D. This paper theoretically and experimentally investigates the robust and layer-selective transports of elastic wave in 3D monolayer- and bilayer-stacked plate-like metamaterial structures. Firstly, considering 3D monolayer-stacked structure, the 2D valley surface states are achieved numerically along the 2D projected plane based on the mechanism of quantum valley Hall effect. The simulation and experimental measurement are performed to confirm the robust transport of 3D elastic wave and backscattering immunity against the straight channel and sharp bends. Then, by stacking the monolayer into bilayer with a twisted angle of 60°, non-zero interlayer coupling of elastic valley layer is introduced and the layer-related topological phase is revealed in the 3D bilayer-stacked structure, giving rise to the 2D topological layer-dependent surface states. Finally, the 3D robust layer-selective transports of elastic wave are tested by experiment. This research provides exciting application perspectives for ultrasonic devices with robustness, lower-power consumption and high-dimensional manipulation.
机译：拓扑绝缘体（TI）具有引导波浪对障碍物的拓扑保护特性和无背散射的结构扰动的特征引起了在包括电磁，声学和弹性系统的各个领域的显着研究兴趣。然而，对于机械系统，实现三维（3D）TI的弹性模拟，其支持二维（2D）平面中的拓扑保护波传播仍然是由于3D中的弹性波的复杂模式偏振导致的挑战。本文理论上实验研究了3D单层和双层堆叠板状超材料结构中弹性波的稳健和层选择性传输。首先，考虑到3D单层堆叠结构，基于量子谷霍尔效应的机制，沿着2D投影平面实现2D谷表面状态。进行模拟和实验测量以确认3D弹性波的鲁棒传输，并反对直通道和尖锐弯曲的反向散射的抗扰度。然后，通过用60°的扭曲角度将单层堆叠成双层，引入了弹性谷层的非零层间耦合，并且在3D双层堆叠的结构中显示了与层相关的拓扑相，产生了2D拓扑结构层依赖的表面状态。最后，通过实验测试弹性波的3D鲁棒层选择性传输。本研究为超声波设备提供了具有稳健性，低功耗和高维操作的超声波设备的令人兴奋的应用视角。

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  • 来源
    《Mechanical systems and signal processing》 |2021年第6期|107543.1-107543.18|共18页
  • 作者

    Shao-yong Huo; Jiu-jiu Chen; Hong-bo Huang; Yong-jian Wei; Zhu-hua Tan; Lu-yang Feng; Xiao-ping Xie;

  • 作者单位

    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 People's Republic of China;

    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 People's Republic of China;

    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 People's Republic of China;

    School of Mechanical Engineering Hebei University of Technology Tianjin 300401 People's Republic of China;

    School of Mechanical Engineering Hebei University of Technology Tianjin 300401 People's Republic of China;

    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 People's Republic of China;

    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    3D elastic wave; 2D topological surface states; Valley topological phase; Layer-selective transport;

    机译：3D弹性波;2D拓扑表面状态;谷拓扑阶段;层选择性运输;

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