Manipulation of acoustic wavefront by transmissive metasurface based on pentamode metamaterials

作     者：Ying Liu Yi-Feng Li Xiao-Zhou Liu 刘颖;李义丰;刘晓宙

作者机构：College of Computer Science and TechnologyNanjing Tech University Key Laboratory of Modern AcousticsMinistry of EducationNanjing University Key Laboratory of Modern AcousticsMinistry of EducationInstitute of Acoustics and School of PhysicsNanjing University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2019年第28卷第2期

页      面：306-312页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.61571222 and 11474160) the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20161009) the Six-Talent Peaks Project of Jiangsu Province,China 

主　　题：metasurface frequency-independent pentamode high transmission 

摘      要：An underwater acoustic metasurface with sub-wavelength thickness is designed for acoustic wavefront *** this paper, a pentamode lattice and a frequency-independent generalized acoustic Snell s law are introduced to overcome the limitations of narrow bandwidth and low transmittance. The bulk modulus and effective density of each unit cell can be tuned simultaneously, which are modulated to guarantee the achievement of refractive index profile and high transmission. Here, we actualize anomalous refraction, generation of non-diffracting Bessel beam, sub-wavelength flat focusing,and surface wave conversion by constructing inhomogeneous acoustic metasurface. This design approach has potential applications in medical ultrasound imaging and underwater acoustic communications.