Enhanced Broadband Manipulation of Acoustic Vortex Beams Using 3‐bit Coding Metasurfaces through Topological Optimization

Author:

Zhao Sheng‐Dong12,Zhang Na‐Li1,Han Ping1,Gu Yan12,Dong Hao‐Wen3ORCID

Affiliation:

1. School of Mathematics and Statistics Qingdao University Qingdao 266071 P. R. China

2. Institute of Mechanics for Multifunctional Materials and Structures Qingdao University Qingdao 266071 P. R. China

3. Institute of Advanced Structure Technology Beijing Institute of Technology Beijing 100081 China

Abstract

AbstractThe acoustic coding metasurfaces (ACMs) have the ability to manipulate complex acoustic behavior by reconstructing the coding sequence. In particular, the design of broadband coding enhances the versatility of ACMs. ACMs offer significant advantages over traditional metasurfaces, including a limited number of units and flexible wave control performance. The unit quantity is determined by 2n, with 1‐bit utilizing 2 units, 2‐bit using 4 units, and 3‐bit employing 8 units. Utilizing multiple bits allows for precise control over the phase of sound waves and enables the realization of more intricate acoustic functions. To address the requirements of broadband multi‐bit applications, this paper presents the development of novel 3‐bit broadband reflected acoustic coding metasurfaces (BACMs) with eight coding units. These metasurfaces are systematically designed using the bottom‐up topology optimization method. A constant phase difference of 45° can be achieved across all eight coding units within a broad frequency range. Additionally, the spiral distribution of phase differences enables the construction of an acoustic vortex metasurface. Moreover, by combining the convolution method, the strategies are outlined for constructing vortex‐focusing metasurfaces and vortex beam manipulation metasurfaces. These 3‐bit coding metasurfaces possess significant potential in the fields of acoustic particle suspension and acoustic communication.

Funder

National Natural Science Foundation of China

Postdoctoral Research Foundation of China

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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