一维弹性波系统中由入射角引起的拓扑界面态
Topological interface states induced by incident angle in the 1D elastic wave system
AI总结：
本文在由两个不同拓扑特性的声子晶体组成的一维复合板结构中，通过入射角调控实现了弹性波拓扑界面态，覆盖SH和P-SV模式，为激发和调控拓扑保护界面态提供了创新方法。
摘要：
拓扑界面态目前在经典波系统中正引起迅速增长的关注。然而，在一维弹性波系统中，关于拓扑界面态的研究很少，尤其是在斜入射情况下。本文从理论上证明了在一维复合板结构中，由两个具有不同拓扑特性的声子晶体组成的结构中，可以实现弹性波的拓扑界面态，并且该界面态可以通过入射角进行调控。对于面外SH模式，多个拓扑界面态可以共存于不同的公共带隙中。对于面内复杂的P-SV耦合模式，拓扑界面态可以存在于“部分偏振”和“全偏振”带隙中。所有这些界面态都处于宽频率和宽入射角区域。我们还讨论了界面态的偏振和模式转换。我们的结果为激发和调控弹性波的拓扑保护界面态提供了一种创新方法，该方法可能在获得不同偏振弹性波模式的强局部振动方面具有潜在应用。
英文摘要：
Topological interface states are currently attracting rapidly growing attention in classical wave systems. However, little work has been done on topological interface states in one-dimensional (1D) elastic wave systems, especially in the case of oblique incidence. This paper theoretically demonstrates the realization of topological interface states of elastic waves in a 1D composite plate structure composed of two phononic crystals (PCs) with different topological characteristics, which can be regulated by the incident angle. For the out-of-plane SH mode, multiple topological interface states can coexist in different common bandgaps. For the in-plane complex P-SV coupled mode, topological interface states can exist in both "partial-polarization" and "omni-polarization" bandgaps. All these interface states are in the wide frequency and incident angle regions. We also discuss the polarization and the mode conversion of the interface states. Our results provide an innovative method to excite and tune topologically protected interface states for elastic waves, which may have potential applications in obtaining strong local vibration for different polarized elastic wave modes.
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