论文标题
通过耦合谐振器限制和引导声音
Confining and channeling sound through coupled resonators
论文作者
论文摘要
限制声音对于操纵和路由声波至关重要。为此，我们提出了一个基于Helmholtz谐振器（HR）的亚波长声通道，该音频在两个超材料的界面形成。通过（i）大幅度降低压力，（ii）特定的声学阻抗（由局部压力与声速的比率定义），量化了限制 - （ii）增加了通道以外的很大值。只要界面相关的边缘模式位于频带隙内，声音限制对于频率和空间障碍是可靠的。通过在拐角处的人力资源单元中引入控制障碍来形成封闭的声电路，这表明将声音限制在某个点上。
Confining sound is of significant importance for the manipulation and routing acoustic waves. We propose a Helmholtz resonator (HR) based subwavelength sound channel formed at the interface of two metamaterials, for this purpose. The confinement is quantified through (i) a substantial reduction of the pressure, and (ii) an increase in a specific acoustic impedance (defined by the ratio of the local pressure to the sound velocity) - to a very large value outside the channel. The sound confinement is robust to frequency as well as spatial disorder at the interface, as long as the interface related edge mode is situated within the band gap. A closed acoustic circuit was formed by introducing controlled disorder in the HR units at the corners, indicating the possibility of confining sound to a point.
