Topology-optimized reflection-type pentamode metasurfaces for broadband underwater beam regulation

IF 2.1 3区 物理与天体物理 Q2 ACOUSTICS
Sheng-Dong Zhao , Yue-Sheng Wang , Chuanzeng Zhang , Hao-Wen Dong
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引用次数: 0

Abstract

Pentamode metamaterials (PMs), a type of customizable artificial liquid-like material, consist of intricate solid microstructural units, offering promising applications in manipulating underwater waves. With their excellent acoustic impedance matching properties with water and customizable equivalent parameters, PMs can surpass the narrowband limitations and facilitate the design of broadband acoustic metasurfaces. However, due to a lack of comprehensive research on PM mechanisms, many researchers opt for conventional regular triangle lattices, limiting both structural diversity and the potential for obtaining precise equivalent parameters. In this study, we propose an inverse optimization strategy to design a series of PM units featuring square lattices. Leveraging the generalized acoustic Snell's law and impedance matching properties of PMs, we construct several reflective broadband subwavelength acoustic metasurfaces. These metasurfaces enable various functionalities based on wavefront manipulation, including an acoustic shielding device capable of converting reflected waves into surface waves across a broad frequency spectrum. Additionally, we achieve broadband anomalous reflection, achromatic focusing, and non-diffracting Bessel beams. Notably, all these achromatic functionalities exhibit relative bandwidths exceeding 100%, indicating promising application prospects.
用于宽带水下波束调节的拓扑优化反射型五模超表面
五模超材料(pm)是一种可定制的人造液体状材料,由复杂的固体微观结构单元组成,在操纵水下波浪方面有很好的应用前景。由于其优异的声阻抗与水的匹配特性和可定制的等效参数,pm可以超越窄带限制,促进宽带声学超表面的设计。然而,由于缺乏对PM机制的全面研究,许多研究人员选择传统的正三角形晶格,限制了结构的多样性和获得精确等效参数的潜力。在这项研究中,我们提出了一种逆优化策略来设计一系列具有方形格子的PM单元。利用广义声斯涅尔定律和介质的阻抗匹配特性,构造了几个反射宽带亚波长声学超表面。这些超表面可以实现基于波前操作的各种功能,包括能够将反射波转换为宽频谱表面波的声屏蔽装置。此外,我们还实现了宽带异常反射、消色差聚焦和无衍射贝塞尔光束。值得注意的是,这些消色差功能的相对带宽均超过100%,具有广阔的应用前景。
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来源期刊
Wave Motion
Wave Motion 物理-力学
CiteScore
4.10
自引率
8.30%
发文量
118
审稿时长
3 months
期刊介绍: Wave Motion is devoted to the cross fertilization of ideas, and to stimulating interaction between workers in various research areas in which wave propagation phenomena play a dominant role. The description and analysis of wave propagation phenomena provides a unifying thread connecting diverse areas of engineering and the physical sciences such as acoustics, optics, geophysics, seismology, electromagnetic theory, solid and fluid mechanics. The journal publishes papers on analytical, numerical and experimental methods. Papers that address fundamentally new topics in wave phenomena or develop wave propagation methods for solving direct and inverse problems are of interest to the journal.
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