3D-Printed Gradient-Index Phononic Crystal Lens for Underwater Acoustic Wave Focusing
3D-Printed Gradient-Index Phononic Crystal Lens for Underwater Acoustic Wave Focusing
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DOI：
10.1103/physrevapplied.13.064064
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发表时间：
2020-06-26
影响因子：
4.6
通讯作者：
Erturk, Alper
中科院分区：
文献类型：
--
作者：
Allam, Ahmed;Sabra, Karim;Erturk, Alper
介绍了一种基于聚合物中空气夹杂物的3D打印梯度折射率声子晶体结构，用于操纵水下声波。所提出的方法使一个简单的配置没有重夹杂物或几何复杂的单位细胞，以创建所需的折射率分布和焦点入射平面波传播在一个已知的方向。在能带结构分析的基础上，设计、制造并测试了梯度折射率透镜，实验结果与水下声波聚焦的有限元模拟结果吻合良好。所提出的概念和所得到的透镜设计可以找到从声学能量传递和收集中的功率增强到感测和成像中的信号增强的应用。
A 3D-printed gradient-index phononic crystal structure based on air inclusions in a polymer is introduced to manipulate underwater acoustic waves. The proposed approach enables a simple configuration without heavy inclusions or geometrically complex unit cells to create the required refractive-index profile and focus incident plane waves propagating in a known direction. Based on the band-structure analysis, a gradient-index lens is designed, fabricated, and tested, yielding an excellent agreement between the experimental results and finite-element simulations of underwater acoustic wave focusing. The proposed concept and the resulting lens design can find applications spanning from power enhancement in acoustic energy transfer and harvesting to signal enhancement in sensing and imaging.