Manipulation of acoustic wavefront by gradient metasurface based on Helmholtz Resonators

被引:62
|
作者
Lan, Jun [1 ]
Li, Yifeng [1 ,2 ]
Xu, Yue [1 ]
Liu, Xiaozhou [3 ,4 ]
机构
[1] Nanjing Tech Univ, Coll Comp Sci & Technol, Nanjing 211800, Jiangsu, Peoples R China
[2] Nanjing Univ, Key Lab Modern Acoust, Minist Educ, Nanjing 210093, Jiangsu, Peoples R China
[3] Nanjing Univ, Inst Acoust, Minist Educ, Key Lab Modern Acoust, Nanjing 210093, Jiangsu, Peoples R China
[4] Nanjing Univ, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China
来源
SCIENTIFIC REPORTS | 2017年 / 7卷
基金
中国国家自然科学基金;
关键词
REFLECTION;
D O I
10.1038/s41598-017-10781-5
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We designed a gradient acoustic metasurface to manipulate acoustic wavefront freely. The broad bandwidth and high efficiency transmission are achieved by the acoustic metasurface which is constructed with a series of unit cells to provide desired discrete acoustic velocity distribution. Each unit cell is composed of a decorated metal plate with four periodically arrayed Helmholtz resonators (HRs) and a single slit. The design employs a gradient velocity to redirect refracted wave and the impedance matching between the metasurface and the background medium can be realized by adjusting the slit width of unit cell. The theoretical and numerical results show that some excellent wavefront manipulations are demonstrated by anomalous refraction, non-diffracting Bessel beam, sub-wavelength flat focusing, and effective tunable acoustic negative refraction. Our designed structure may offer potential applications for the imaging system, beam steering and acoustic lens.
引用
收藏
页数:9
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