A broadband planar acoustic metamaterial lens

•Acoustic devices with metamaterials based on quasi-conformal mapping.•Design acoustic devices by using isotropic materials.•Retrieve the effective parameters of the unit cell. Based on quasi-conformal mapping approach, we propose a two-dimensional broadband and low-loss planar lens in the acoustic...

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Bibliographic Details
Published in:Physics letters. A 2019-06, Vol.383 (16), p.1955-1959
Main Authors: Dong, Hui Yuan, Wang, Jin, Song, Gang Yong, Tang, Wen Xuan, Cheng, Qiang
Format: Article
Language:English
Subjects:
Acoustic metamaterials
Effective medium theory
Quasi-conformal mapping
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Summary:•Acoustic devices with metamaterials based on quasi-conformal mapping.•Design acoustic devices by using isotropic materials.•Retrieve the effective parameters of the unit cell. Based on quasi-conformal mapping approach, we propose a two-dimensional broadband and low-loss planar lens in the acoustic regime, which can be realized using gradient-index sub-wavelength artificial structures with hard boundary. In this design, QCM is employed in the acoustic regime to convert a parabolic form into a planar one, which makes the resultant material approximately isotropic through minimizing the anisotropic factor. It is found that the planar lens can show the same performance as its parabolic counterparts over a broadband range of frequency. Moreover, the lens is fabricated via 3D printing technology and measured experimentally, which gives identical results with the theoretical prediction. The proposed technique could be extended to realize different acoustic devices and applied for a series of practical applications.
ISSN:0375-9601
1873-2429
DOI:10.1016/j.physleta.2019.03.014