各向同性材料制成的复合板中的非对称λ模的连续状态。

IF 2.1 3区 物理与天体物理 Q2 ACOUSTICS Wave Motion Pub Date : 2024-05-15 DOI:10.1016/j.wavemoti.2024.103348
Nan Gao , Ricardo Martin Abraham-Ekeroth , Daniel Torrent
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引用次数: 0

摘要

在这项研究中,我们报告了连续体中的束缚态(BICs)的数值设计和观测。弹性波系统,尤其是非周期构型的弹性波系统,由于其错综复杂的偏振态,很难获得 BIC。然而,对这一问题的研究已变得非常重要,尤其是在微米或纳米尺度的光学机械或其他多场耦合领域。为了说明设计理念,我们模拟了在无限薄的硅板中引入一块二氧化硅(SiO2)的过程,结果表明,对于特定的长宽比,可以预测弹性波的 BIC。我们给出了二维(2D)矩形板和三维(3D)圆盘结构的数值结果。此外,我们还研究了 BIC 发生时背景介质和包含介质的模态贡献,进一步验证了我们设计策略的物理背景。虽然我们的工作重点是非对称 Lamb 模式,但目前的方法也可用于构建其他类型的弹性波 BIC,为基于控制或引导弹性波的超材料器件原型开发提供了有力工具。
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Bound states in the continuum for antisymmetric lamb modes in composite plates made of isotropic materials

In this study, we report a numerical design and observation of bound states in the continuum (BICs) for Lamb waves. BICs for elastic-wave systems, especially in non-periodic configurations, are difficult to obtain due to their intricate polarization states. However, the study in this matter has become very important, especially in the field of opto-mechanics or other multi-field couplings at micro or nanoscales. To illustrate the design concept, we simulate the introduction of a piece of silica (SiO2) into a thin infinite Si plate and show that, for specific aspect ratios, BICs for elastic waves can be predicted. We present numerical results for both two-dimensional (2D) rectangular plates and three-dimensional (3D) disk structures. Moreover, we also investigate the modal contributions of both the background and inclusion media during the occurrence of BICs, further verifying the physical background of our design strategy. Although we have focused our work on asymmetric Lamb modes, the current method can also be applied to construct other types of elastic-wave BICs, providing a powerful tool for metamaterial device prototyping based on the control or guiding of elastic waves.

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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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