Efficient Asymmetric Transmission of Elastic Waves in Thin Plates with Lossless Metasurfaces
Efficient Asymmetric Transmission of Elastic Waves in Thin Plates with Lossless Metasurfaces
复制标题
DOI：
10.1103/physrevapplied.14.054029
复制
发表时间：
2020-05
影响因子：
4.6
通讯作者：
Bing Li;Yabin Hu;Jianlin Chen;Guangyuan Su;Yongquan Liu;Meiying Zhao;Zheng Li
中科院分区：
文献类型：
--
作者：
Bing Li;Yabin Hu;Jianlin Chen;Guangyuan Su;Yongquan Liu;Meiying Zhao;Zheng Li
我们既不需要有源元件，也不需要复杂的设计，我们提出并实验证明了一种仅使用一层无损超表面的薄板中不扭曲的非对称弹性波传输的通用框架。不对称透射源于超表面两侧+1阶和-1阶衍射不均匀。与以往的损失诱导策略相比，该超表面在运输侧几乎保持全透射，但在对面保持全反射，透射对比度更高。此外，我们还证明了这种强不对称特性对频率、入射角和损耗效应具有鲁棒性。本工作为弹性动力学和声学中的紧凑整流、高分辨率超声成像、振动和噪声控制开辟了新的途径。
Requiring neither active components nor complex designs, we propose and experimentally demonstrate a generic framework for undistorted asymmetric elastic-wave transmission in a thin plate just using a layer of lossless metasurface. The asymmetric transmission stems from the uneven diffraction of +1 and -1 orders on opposite sides of the metasurface, respectively. Compared with previous loss-induced strategies, the present metasurface maintains a nearly total transmission for the transportation side, but a total reflection from the opposite side, exhibiting a higher contrast ratio of transmission. Moreover, we illustrate that this strong asymmetric behavior is robust to the frequency, the incident angle and the loss effect. The present work paves new avenues to compact rectification, high resolution ultrasonography, vibration and noise control in elastodynamics and acoustics.