Multiple-band transmission of acoustic wave through metallic gratings
Multiple-band transmission of acoustic wave through metallic gratings
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DOI：
10.1063/1.4742929
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发表时间：
2012-08
影响因子：
4
通讯作者：
D. Qi;Renhao Fan;R. Peng;Xianrong Huang;Ming-Hui Lu;Xu Ni;Qing Hu;Mu Wang
中科院分区：
文献类型：
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作者：
D. Qi;Renhao Fan;R. Peng;Xianrong Huang;Ming-Hui Lu;Xu Ni;Qing Hu;Mu Wang
在这项工作中，我们证明了声波可以实现非常平坦的传输通过金属光栅下的倾斜入射在多个频带分离的伍德的异常。在低频段，声波的透射率与频率无关，呈现平坦曲线，透射效率可达100%左右;而在高频段，由于衍射效应，透射率降低，呈现较低的平坦曲线。透射效率对光栅厚度不敏感。这一现象通过实验、数值模拟和分析模型得到了验证。宽带高透射率归因于空气与光栅之间的声阻抗匹配。这项研究可能会为声光栅的各种潜在应用开辟一个领域，包括宽带声波成像和筛查、光栅干涉测量和防反射隐身。
In this work, we demonstrate that acoustic waves can achieve extremely flat transmission through a metallic grating under oblique incidence within multiple frequency bands separated by Wood’s anomalies. At the low-frequency band, the transmission of acoustic wave is independent of the frequency and presents a flat curve with the transmission efficiency reaching about 100%; while at high-frequency bands, the transmission decreases to be lower flat curves due to the diffraction effect. The transmission efficiency is insensitive to the thickness of the grating. This phenomenon is verified by experiments, numerical simulations, and an analytical model. The broadband high transmission is attributed to the acoustic impedance matching between the air and the grating. This research may open up a field for various potential applications of acoustic gratings, including broadband sonic imaging and screening, grating interferometry, and antireflection cloaking.