基于幅相解耦调制的透射型声超表面的声波调控  

Acoustic modulation of transmission-type acoustic metasurface based on amplitude-phase decoupling modulation

作　　者：孟愉晟 蓝君[1] 李义丰[1] MENG Yusheng;LAN Jun;LI Yifeng(College of Computer and Information Engineering(College of Artificial Intelligence),Nanjing Tech University,Nanjing 211800,Jiangsu,China)

机构地区：[1]南京工业大学计算机与信息工程学院(人工智能学院),江苏南京211800

出　　处：《声学技术》2024年第5期601-612,共12页Technical Acoustics

基　　金：国家自然科学基金(61571222);江苏省自然科学基金(BK20210541);江苏省高校自然科学研究项目(21KJB140003)。

摘　　要：文章构造了一种复合型无源结构,利用该结构设计的声学超表面能够实现透射相位和幅度的解耦调控。研究表明,当声波入射至该复合结构后,多腔体结构具有接近于1的透射率和接近于2π的全相位变化,而开孔结构单元可以提供恒定不变的相位和0~1范围内变化的透射率。此外,根据Airy函数的波曲线,选择合适的结构参数,构造出的超表面可以在空气中生成Airy波束,同时利用两个对称的超表面可以实现具有自愈性声聚焦特性的透镜,通过与纯相位调控方法生成的波束现象进行对比,进一步说明幅相解耦方法对于声波精确调控的重要性。文章对于幅相解耦超表面的研究在声波定向传输、全息图像、医学超声成像等方面具有潜在的应用前景。In this paper,a hybrid passive structure is constructed.By using the acoustic metasurface with this structure,the decoupling control of the phase and amplitude of transmitted waves can be realized.The results show that the multi-cavity structure has a transmittance close to 1 and an all-phase variation close to 2πwhen the sound wave is incident into the composite structure,and the open-hole structure unit can provide a constant phase and a transmittance varying from 0 to 1.In addition,based on the wave curve of Airy's function and selecting suitable structural parameters,the constructed metasurface can generate Airy beams in air,and a lens with self-healing acoustic focusing properties can be achieved with two symmetric metasurfaces.The importance of the amplitude-phase decoupling method for accurate acoustic wave control is further demonstrated by comparison with the pure phase control method.The study of amplitude-phase decoupled metasurfaces in this paper has potential applications in acoustic directional transmission,holographic images,medical ultrasound imaging,and so on.

关 键 词：透射型声超表面 幅相解耦调控 传递矩阵法 Airy波束 自愈性声聚焦 

分 类 号：O422[理学—声学]