Design and demonstration of broadband thin planar diffractive acoustic lenses
Design and demonstration of broadband thin planar diffractive acoustic lenses
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DOI：
10.1063/1.4895619
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发表时间：
2014-09-08
影响因子：
4
通讯作者：
Cummer, Steven A.
中科院分区：
文献类型：
--
作者：
Wang, Wenqi;Xie, Yangbo;Cummer, Steven A.
本文提出了两种具有亚波长厚度、平面形状和宽工作带宽的衍射声透镜。在我们的设计中利用了具有固有宽带有效材料特性的锥形单胞。测量和模拟结果都展示了超过40%的中心频率的透镜效应。还演示了高斯调制正弦脉冲的聚焦。这一工作为利用超材料设计衍射声透镜和更广义的相位工程衍射元件奠定了基础。(C)2014 AIP Publishing LLC.
We present here two diffractive acoustic lenses with subwavelength thickness, planar profile, and broad operation bandwidth. Tapered labyrinthine unit cells with their inherently broadband effective material properties are exploited in our design. Both the measured and the simulated results are showcased to demonstrate the lensing effect over more than 40% of the central frequency. The focusing of a propagating Gaussian modulated sinusoidal pulse is also demonstrated. This work paves the way for designing diffractive acoustic lenses and more generalized phase engineering diffractive elements with labyrinthine acoustic metamaterials. (C) 2014 AIP Publishing LLC.