论文标题
通过拓扑超材料通过障碍诱导的信号过滤
Disorder-induced signal filtering with topological metamaterials
论文作者
论文摘要
普遍认为，疾病在现实结构中普遍存在，会干扰模拟波形的性能，因为它通常会引起强大的多重散射效应，从而在很大程度上会阻碍波传输。与这种一般观点相反，这里表明，在某些具有非平凡拓扑特征的波系统中，强大的随机性可能是非常有益的，可以充当强大的刺激器，以实现所需的模拟滤波操作。这是在拓扑安德森声音晶体中实现的，在主导随机性方面，它提供了明确定义的过滤响应，其特征在于洛伦兹光谱线形状。我们的理论和实验结果是声学中拓扑安德森绝缘子阶段的首次实现，这表明通过在清洁结构中添加随机性来实现特定的非随机模拟过滤操作的惊人可能性。
Disorder, ubiquitously present in realistic structures, is generally thought to disturb the performance of analog wave devices, as it often causes strong multiple scattering effects that largely arrest wave transportation. Contrary to this general view, here, it is shown that, in some wave systems with non-trivial topological character, strong randomness can be highly beneficial, acting as a powerful stimulator to enable desired analog filtering operations. This is achieved in a topological Anderson sonic crystal that, in the regime of dominating randomness, provides a well-defined filtering response characterized by a Lorentzian spectral line-shape. Our theoretical and experimental results, serving as the first realization of topological Anderson insulator phase in acoustics, suggest the striking possibility of achieving specific, non-random analog filtering operations by adding randomness to clean structures.
