Li Ying, Ren Zhiwen, Yuan Xujin, Chen Mingji, Cao Wenkang, Cheng Qiang, Jin Zhongkun, Cheng Xiaodong, Zhang Cheng, Yang Jun, Fang Daining
Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China.
School of Information Science and Engineering, Southeast University, Nanjing 210096, China.
J Acoust Soc Am. 2019 Jul;146(1):166. doi: 10.1121/1.5116012.
Acoustic metasurfaces show non-traditional abilities in wave manipulation and provide alternate mechanisms for information communication and invisibility technology. However, most of the mechanisms remain narrow band (relative bandwidth ∼5%), and a wideband trait is essential for engineering applications. For example, controllable effective material properties-reflection or transmission phase-has barely been realized in wideband because the intrinsic dispersion relation is not always editable. In this paper, wideband reflection phase editing is realized, and wideband invisibility of a phase preserved Huygens's metasurface on a flat background is achieved with anomalous reflection. This metasurface is built with proposed unsymmetrical twin Helmholtz resonators which reach a predefined dispersion relation target value. The total instantaneous acoustic fields show nearly identical carpeting effects in a consecutive band with relative bandwidth 52.1% (from 5400 to 9200 Hz) in simulation and experiment.
声学超表面在波操控方面展现出非传统的能力，并为信息通信和隐身技术提供了替代机制。然而，大多数机制仍为窄带（相对带宽约5%），而宽带特性对于工程应用至关重要。例如，可控的有效材料特性——反射或透射相位——在宽带中几乎尚未实现，因为固有色散关系并非总能被编辑。在本文中，实现了宽带反射相位编辑，并通过反常反射在平坦背景上实现了相位保持惠更斯超表面的宽带隐身。该超表面由所提出的非对称双亥姆霍兹谐振器构建而成，其达到了预定义的色散关系目标值。在模拟和实验中，总瞬时声场在相对带宽为52.1%（从5400至9200赫兹）的连续频段内显示出几乎相同的地毯效应。
