论文标题
超人物的声音控制，具有深波长浆质金属质量
Ultrabroadband sound control with deep-subwavelength plasmacoustic metalayers
论文作者
论文摘要
控制声音需要固有的宽带和次波长声学解决方案，这些解决方案至关重要。这包括当前的吸收方法，例如多孔材料或声音谐振器，通常低于1 kHz或从根本上窄带效率低下。在这里，我们通过介绍浆膜金属蛋白的概念来解决这个烦恼的问题。我们证明，可以控制一小层空气等离子体的动力学，以以超人的方式和深层波长的距离与声音相互作用。利用浆膜金属质量的独特物理学，我们在超过二十多年内表现出了完美的声音吸收和可调的声学反射，从几个Hz到KHz范围，厚度均匀的等离子层呈透明的等离子体层，降低到$λ/1000 $。这种前所未有的带宽和紧凑性在各种应用中打开了新的门，包括噪声控制，音频工程，房间声学，成像和超材料设计。
Controlling audible sound requires inherently broadband and subwavelength acoustic solutions, which are to date, crucially missing. This includes current noise absorption methods, such as porous materials or acoustic resonators, which are typically inefficient below 1 kHz, or fundamentally narrowband. Here, we solve this vexing issue by introducing the concept of plasmacoustic metalayers. We demonstrate that the dynamics of small layers of air plasma can be controlled to interact with sound in an ultrabroadband way and over deep-subwavelength distances. Exploiting the unique physics of plasmacoustic metalayers, we experimentally demonstrate perfect sound absorption and tunable acoustic reflection over more than two frequency decades, from several Hz to the kHz range, with transparent plasma layers of thicknesses down to $λ/1000$. Such unprecedented bandwidth and compactness opens new doors in a variety of applications, including noise control, audio-engineering, room acoustics, imaging and metamaterial design.
