论文标题
声学金属
Acoustic Metal
论文作者
论文摘要
金属反映了电磁波，因为导致耗散的较大电导率。在此期间，波浪经历了独立于频率的180美元$^\ circ $相变。没有用于声波的对应物材料。在这里，我们表明，通过使用具有设计的高密度耗散组件的一系列声学谐振器，可以实现“声学金属”，即强烈地伴侣在传统均值上无法实现声音范围内的声音。特别是，我们显示了声学法拉第笼子的效果，即当用作覆盖气管的环时，可以阻塞99％的噪声而不会阻碍气流。我们进一步根据因果原理的限制来描述声学金属的基本数量要求。我们的发现补充了声学材料的缺失特性，并为强烈的波材料耦合铺平了道路，这对于作为高性能音频设备的应用至关重要。
Metal reflects electromagnetic waves because of the large conductivity that is responsible for dissipation. During which the waves undergo a 180$^\circ$ phase change that is independent of the frequency. There is no counterpart material for acoustic waves. Here we show that by using an array of acoustic resonators with a designed high-density dissipative component, an "acoustic metal" can be realised that strongly couples with sound over a wide frequency range not otherwise attainable by conventional means. In particular, we show the acoustic Faraday cage effect that when used as a ring covering an air duct, 99% of the noise can be blocked without impeding the airflow. We further delineate the underlying volume requirement for an acoustic metal based on the constraint of the causality principle. Our findings complement the missing properties of acoustic materials and pave the way to the strong wave-material couplings that are critical for the applications as high-performance audio devices.
