Reflected Wavefront Modulation with Phase Array by Using Acoustic Metasurface  

作　　者：CHENG Yong LIANG Qingxuan CHEN Tianning GUO Jianyong 

机构地区：[1]State Key Laboratory for Manufacturing Systems Engineering,School of Mechanical Engineering,Xi’an Jiaotong University

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2019年第3期510-516,共7页南京航空航天大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.51575431);the China Postdoctoral Science Foundation Funded Project (Nos. 2014M550485, 2015T81019);the Fundamental Research Funds for the Central Universities (No.xjj2015098);the Shaanxi Province Postdoctoral Science Foundation Funded Project

摘　　要：Acoustic metasurface has attracted increasing attention due to the ability of manipulating the transmitted and reflected phase of waves to generate various acoustic functionalities with planar layer of sub-wavelength structure.We design an acoustic metasurface with a semi-closed and nested slotted tube array,and it possesses the capacity of modulating the reflected phase with sub-wavelength thickness (about λ/23).The reflected phase shifts can be obtained from 0 to 2π by different rotation angles of internal slotted tubes.The theoretical results agree well with the numerical results by a finite element method.The results show that some excellent wavefront manipulations are demonstrated with the phase array by using acoustic metasurface such as anomalous reflection and sub-wavelength flat focusing.The design may offer a path for acoustic manipulation and promote the potential applications of acoustic metasurface in low frequency noise control,acoustic imaging and cloaking.Acoustic metasurface has attracted increasing attention due to the ability of manipulating the transmitted and reflected phase of waves to generate various acoustic functionalities with planar layer of sub?wavelength structure.We design an acoustic metasurface with a semi?closed and nested slotted tube array,and it possesses the capacity of modulating the reflected phase with sub ? wavelength thickness(about λ/23). The reflected phase shifts can be obtained from 0 to 2π by different rotation angles of internal slotted tubes. The theoretical results agree well with the numerical results by a finite element method. The results show that some excellent wavefront manipulations are demonstrated with the phase array by using acoustic metasurface such as anomalous reflection and sub?wavelength flat focusing. The design may offer a path for acoustic manipulation and promote the potential applications of acoustic metasurface in low frequency noise control,acoustic imaging and cloaking.

关 键 词：acoustic metasurface anomalous reflection phase gradient semi-closed and nested slotted tube 

分 类 号：O429[理学—声学]