Non-reciprocal Rayleigh wave propagation in space–time modulated surface
Non-reciprocal Rayleigh wave propagation in space–time modulated surface
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DOI：
10.1016/j.jmps.2020.104196
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发表时间：
2021
影响因子：
5.3
通讯作者：
Qian Wu;Hui Chen;H. Nassar;Guoliang Huang
中科院分区：
文献类型：
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作者：
Qian Wu;Hui Chen;H. Nassar;Guoliang Huang
在光子晶体和声子晶体领域，研究波的非互易传播对于实现具有潜在工程应用价值的柔性单向传播器件具有重要意义。在这里，非互易瑞利波的研究在一个连续的二维（2D）半无限介质与一个阵列的时空调制弹簧质量振子绑定。所涉及的调制是连续介质表面的波状扰动，其破坏了时间反演对称性和互易性。为了研究瑞利波在具有连续和离散界面的复杂二维介质中的传播特性，采用渐近方法和耦合模理论对瑞利波的色散工程带隙进行了解析研究，并通过数值模拟进行了验证。具体来说，非互易传输的瑞利波与单向模式转换的说明，和各种相关的物理量，包括转换长度和带隙大小，定量估计。这项工作揭示了从工程结构的传感和评估到基于导波的损伤检测技术的瑞利波传播的通用控制。
Research on non-reciprocal propagation of waves is of great significance in the field of photonic and phononic crystals for realizing flexible one-way propagation devices with potential engineering applications. Here, non-reciprocal Rayleigh waves are investigated in a continuous two-dimensional (2D) semi-infinite medium bound with an array of space–time modulated spring–mass oscillators. The involved modulation is a wave-like perturbation of the surface of the continuous medium that breaks time-reversal symmetry and reciprocity. To characterize the propagation of Rayleigh waves in such a complex 2D medium with continuous and discrete interface, an analytical study is performed to obtain dispersion-engineered bandgaps by adopting the asymptotic method and coupled mode theory, which is also validated by numerical simulation. Specifically, the non-reciprocal transmission of Rayleigh waves with one-way mode conversion is illustrated, and various relevant physical quantities, including conversion length and band gap size, are quantitatively estimated. This work sheds light on versatile control of Rayleigh wave propagation ranging from sensing and evaluation of engineering structures to guided wave-based damage detection techniques.