Enhanced Broadband Manipulation of Acoustic Vortex Beams Using 3-bit Coding Metasurfaces through Topological Optimization,Small

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Enhanced Broadband Manipulation of Acoustic Vortex Beams Using 3-bit Coding Metasurfaces through Topological Optimization
Small ( IF 13.0 ) Pub Date : 2024-01-17 , DOI: 10.1002/smll.202308349
Sheng-Dong Zhao _{1,

2} , Na-Li Zhang ₁ , Ping Han ₁ , Yan Gu _{1,

2} , Hao-Wen Dong ₃

Affiliation

The 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.

中文翻译：

通过拓扑优化使用 3 位编码超表面增强声涡流的宽带操控

声学编码超表面（ACM）能够通过重建编码序列来操纵复杂的声学行为。特别是宽带编码的设计增强了ACM的多功能性。与传统超表面相比，ACM 具有显着优势，包括单元数量有限和灵活的波控制性能。单元数量由2 ⁿ确定，1位使用2个单元，2位使用4个单元，3位使用8个单元。利用多个位可以精确控制声波的相位，并能够实现更复杂的声学功能。为了满足宽带多位应用的要求，本文提出了具有八个编码单元的新型3位宽带反射声学编码超表面（BACM）的开发。这些超表面是使用自下而上的拓扑优化方法系统设计的。在很宽的频率范围内，所有八个编码单元都可以实现 45° 的恒定相位差。此外，相位差的螺旋分布使得声涡超表面的构造成为可能。此外，结合卷积方法，概述了构建涡旋聚焦超表面和涡旋束操纵超表面的策略。这些 3 位编码超表面在声学粒子悬浮和声学通信领域具有巨大的潜力。

更新日期：2024-01-17

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