基于一维渐变语音晶体板的板模波拓扑彩虹陷阱

IF 2.5 4区 物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xiangzhen Bu, Hongbo Huang, Jiujiu Chen, Xiaoping Xie
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引用次数: 0

摘要

本文将拓扑彩虹的概念引入到一维声子晶体板的板模波系统中,通过采用梯度调谐的苏-施里弗-希格(SSH)结构实现了可调拓扑弹性彩虹陷波。首先,基于经典的 SSH 模型,建立了由钢和铝组成的声波晶体板,并利用有限元方法研究了板模波的带状结构。通过改变单元格中钢的高度,可以诱导带反转,从而导致拓扑相变。然后,将具有不同拓扑特性的声子晶体连接起来,形成声子晶体板,实现拓扑界面态。此外,还构建了一个类似三明治的超薄结构,将相邻的两个拓扑界面态耦合在一起。最后,在梯度结构参数下设计了声子晶体板的一维交变 SSH 结构,并基于特征频率和全波模拟,实现了基于耦合界面态的可调拓扑彩虹陷阱。所设计的器件能捕获超过 15 kHz 的宽频,为弹性能量收集器件的设计提供了更多可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Topological Rainbow Trapping of Plate‐Mode Waves Based on 1D Gradual Phononic Crystal Slabs
In this article, the concept of topological rainbow is introduced into the plate‐mode waves system of 1D phononic crystal slabs, achieving adjustable topological elastic rainbow trapping by employing gradient‐tuned Su–Schrieffer–Heeger (SSH) structures. First, based on the classical SSH model, a phononic crystal slab composed of steel and aluminum is set up, and the band structure of plate‐mode waves is studied using the finite‐element method. Band inversion can be induced by changing the height of the steel in the unit cell, leading to topological phase transitions. Then, phononic crystals with different topological properties are connected to form a phononic crystal slab, realizing topological interface states. Furthermore, a sandwich‐like ultrathin structure is constructed to couple the adjacent two topological interface states. Finally, a 1D alternating SSH structure of phononic crystal slab is designed under gradient structural parameters, and based on eigenfrequency and full‐wave simulation, adjustable topological rainbow trapping based on coupled interface states is achieved. The designed device can trap wide frequencies exceeding 15 kHz, providing more possibilities for the design of elastic‐energy‐harvesting devices.
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来源期刊
Physica Status Solidi-Rapid Research Letters
Physica Status Solidi-Rapid Research Letters 物理-材料科学:综合
CiteScore
5.20
自引率
3.60%
发文量
208
审稿时长
1.4 months
期刊介绍: Physica status solidi (RRL) - Rapid Research Letters was designed to offer extremely fast publication times and is currently one of the fastest double peer-reviewed publication media in solid state and materials physics. Average times are 11 days from submission to first editorial decision, and 12 days from acceptance to online publication. It communicates important findings with a high degree of novelty and need for express publication, as well as other results of immediate interest to the solid-state physics and materials science community. Published Letters require approval by at least two independent reviewers. The journal covers topics such as preparation, structure and simulation of advanced materials, theoretical and experimental investigations of the atomistic and electronic structure, optical, magnetic, superconducting, ferroelectric and other properties of solids, nanostructures and low-dimensional systems as well as device applications. Rapid Research Letters particularly invites papers from interdisciplinary and emerging new areas of research.
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