Programmable Acoustic Metasurfaces
Programmable Acoustic Metasurfaces
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DOI：
10.1002/adfm.201808489
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发表时间：
2019-03-28
影响因子：
19
通讯作者：
Huang, Tony Jun
中科院分区：
文献类型：
--
作者：
Tian, Zhenhua;Shen, Chen;Huang, Tony Jun
超颖表面为使用亚波长片的波动工程开辟了前所未有的潜力。然而，当前声学元表面的严重限制是它们差的可重构性以按需实现不同的功能。在这里，一个可编程的声学元表面，包含一个可调的亚波长单元阵列，以打破限制，实现通用的二维波操纵功能的报告。超颖表面的每个单元格由一个直通道和五个并联的亥姆霍兹谐振器组成，其有效质量可以通过鲁棒的流体系统进行调谐。通过每个单胞传播的声波的相位和振幅可以被动态地和连续地调制。基于这种机制，超颖表面能够通过在亚波长尺度上设计透射波的相位和振幅来实现多功能的波操纵功能。通过声场扫描实验，直观地展示了一种超表面设计实现的声波操控、工程声束操控和声能流开关等多种波操控功能。这项工作扩展了超颖表面的研究，并具有很大的潜力，广泛的应用，包括声学成像，通信，悬浮和镊子。
Metasurfaces open up unprecedented potential for wave engineering using subwavelength sheets. However, a severe limitation of current acoustic metasurfaces is their poor reconfigurability to achieve distinct functions on demand. Here a programmable acoustic metasurface that contains an array of tunable subwavelength unit cells to break the limitation and realize versatile two-dimensional wave manipulation functions is reported. Each unit cell of the metasurface is composed of a straight channel and five shunted Helmholtz resonators, whose effective mass can be tuned by a robust fluidic system. The phase and amplitude of acoustic waves transmitting through each unit cell can be modulated dynamically and continuously. Based on such mechanism, the metasurface is able to achieve versatile wave manipulation functions, by engineering the phase and amplitude of transmission waves in the subwavelength scale. Through acoustic field scanning experiments, multiple wave manipulation functions, including steering acoustic waves, engineering acoustic beams, and switching on/off acoustic energy flow by using one design of metasurface are visually demonstrated. This work extends the metasurface research and holds great potential for a wide range of applications including acoustic imaging, communication, levitation, and tweezers.