Asymmetric transmission of acoustic waves in a waveguide via gradient index metamaterials

作     者：Wen-Kang Cao Li-Ting Wu Cheng Zhang Jun-Chen Ke Qiang Cheng Tie-Jun Cui Yun Jing 

作者机构：State Key Laboratory of Millimeter WavesDepartment of Radio EngineeringSoutheast UniversityNanjing 210096China Department of Mechanical and Aerospace EngineeringNorth Carolina State UniversityRaleighNC 27695USA 

出 版 物：《Science Bulletin》 (科学通报（英文版）)

年 卷 期：2019年第64卷第12期

页      面：808-813页

核心收录：

学科分类：07[理学] 08[工学] 

基　　金：supported by the National Key Research and Development Program of China(2017YFA0700201,2017YFA0700202,and 2017YFA0700203) the National Natural Science Foundation of China(61631007,61571117,61138001,61371035,61722106,61731010 and 11227904) the 111Project(111-2-05) 

主　　题：Asymmetric transmission Surface waves Gradient index metamaterials Waveguide 

摘      要：We demonstrate that asymmetric acoustic wave transmission in a waveguide can be achieved via gradient index metamaterials(GIMs). We theoretically prove that the acoustic wave can be efficiently converted to surface waves(SWs) via GIMs. The GIMs in a waveguide can allow the transmission of acoustic waves in one direction but block them in the other direction. This theory is validated by experiments. Our findings may provide new applications in various scenarios such as high-efficiency acoustic couplers and noise control.