三维局部共振声元流体负折射实验研究
Experimental demonstration of negative refractionwith 3D locally resonant acoustic metafluids
摘要：
声波的负折射是通过在超声波频率下进行的三维局部共振声学超流体实验证明的，该超流体由软多孔硅橡胶微珠悬浮在屈服应力流体中制成。根据斯涅耳定律，通过测量声束穿过这种棱柱形超流体的折射角，我们确定了对水的声学指数。这些实验数据，然后进行了比较，一个很好的协议进行计算的框架内的多重散射理论表明，出现负折射取决于体积分数$Φ$的共振微珠。对于稀释的元流体（$Φ=3\%$），仅发生正折射，而对于浓缩的元流体（$Φ=17\%$），在宽频带上表现出负折射。
英文摘要：
Negative refraction of acoustic waves is demonstrated through underwater experiments conducted at ultrasonic frequencies on a 3D locally resonant acoustic metafluid made of soft porous silicone-rubber micro-beads suspended in a yield-stress fluid. By measuring the refracted angle of the acoustic beam transmitted through this metafluid shaped as a prism, we determine the acoustic index to water according to Snell's law. These experimental data are then compared with an excellent agreement to calculations performed in the framework of Multiple Scattering Theory showing that the emergence of negative refraction depends on the volume fraction $Φ$ of the resonant micro-beads. For diluted metafluid ($Φ=3\%$), only positive refraction occurs whereas negative refraction is demonstrated over a broad frequency band with concentrated metafluid ($Φ=17\%$).
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