Structurally tunable acoustic transmission-coded metamaterials

Author:

Cui Qinghao12ORCID,Wang Jilai12ORCID,Tang Xuefeng3ORCID,Li Quhao12ORCID,Men Junhui12,Wan Yi12

Affiliation:

1. Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, School of Mechanical Engineering, Shandong University 1 , Jinan, Shandong 250061, China

2. National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University 2 , Jinan, Shandong 250061, China

3. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology 3 , Wuhan 430074, China

Abstract

The introduction of metasurfaces has renewed Snell's law, and the metasurfaces can manipulate sound waves flexibly. In this paper, a coding metasurface with a simple and adjustable coding unit for sound wave transmission is proposed. By changing the orientation of a movable part in a fixed structure, conversion is achieved between two types of units with a phase difference of 180° and high transmittance (>75%). By combining the two types of units, the phases of sound waves can be regulated dynamically. Structural simulations are performed using finite-element software, and the beam splitting of the transmitted sound wave is verified by theoretical analysis and experiments under plane wave incidence in the frequency range of 4.7–5.7 kHz. In addition, the two types of units are used to design a coding Fresnel lens, and its simulated focusing performance is verified by experiments at 4.7–5.7 kHz.

Publisher

AIP Publishing

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