论文标题
非共鸣的元元凝胶中的超慢声音
Ultra-slow sound in non-resonant meta-aerogel
论文作者
论文摘要
用声学超材料操纵声音是一个深入研究的领域，尽管存在明显的缺点，但通过共振的相互作用是一种常见的应用。我们提出了一种新的程序，用于引入精心设计的耦合接口，细胞大小小于10 nm的耦合接口到超柔软的多孔培养基中，以制备荟萃凝胶，其中声音传播在非共振模式下显着延迟。根据我们的分析模型，所得的声速度显示为具有质量密度和组件的质量分数比的缩放定律。我们已经准备了一个最慢的62 m/s的元凝胶。据我们所知，这是紧凑型固体材料的最低价值，并且可以进一步放慢我们的程序。这种元凝胶的发展可以促进旨在采用非谐波型慢速声音（或相延迟）的声学超材料中的关键应用。后者的示例包括深度次波长的元表和其他聚焦成像或转换声学，需要高度对比度的声速。
The manipulation of sound with acoustic metamaterials is a field of intense research, where interaction via resonance is a common application despite the significant disadvantages. We propose a novel procedure for introducing well-designed coupling interfaces with a cell size of less than 10 nm into an ultra-soft porous medium, to prepare a meta-aerogel, where the sound propagation is significantly delayed in a non-resonant mode. The resultant sound velocity is shown as a scaling law with the mass density and the mass fraction ratio of the components, in accordance with our analytical model. We have prepared a meta-aerogel with the slowest sound velocity of 62 m/s. To the best of our knowledge, this is the lowest value in compact solid materials, with a prospect of further slowing down by our procedure. The development of such meta-aerogels can facilitate key applications in acoustic metamaterials intended to employ non-resonant type slow sound (or phase delay). Examples of the latter include deep subwavelength meta-surface and other focused imaging or transformation acoustics that require a high contrast of sound velocity.
