声学亚原子的极化率和偶极极化率的测量
Measuring monopole and dipole polarizability of acoustic meta-atoms
摘要：
本文提出了一种从二维声学元原子的实验测量中提取极化率和偶极极化率的方法。与从数值结果中提取的结果相反，这使得所有的二阶效应和材料特性的不确定性都可以考虑在内。我们将该技术应用于3D打印的各种几何形状的超原子。我们发现，具有较短的声学路径长度的结构的极化率与数值结果吻合得很好。然而，那些具有较长的路径长度遭受强大的附加阻尼，我们归因于在狭窄的通道中的强大的粘性和热损失。
英文摘要：
We present a method to extract monopole and dipole polarizability from experimental measurements of two-dimensional acoustic meta-atoms. In contrast to extraction from numerical results, this enables all second-order effects and uncertainties in material properties to be accounted for. We apply the technique to 3D-printed labyrinthine meta-atoms of a variety of geometries. We show that the polarizability of structures with shorter acoustic path length agrees well with numerical results. However, those with longer path lengths suffer strong additional damping, which we attribute to the strong viscous and thermal losses in narrow channels.
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