Non-Hermitian topological light steering
Non-Hermitian topological light steering
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DOI：
10.1126/science.aay1064
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发表时间：
2019-09
期刊：
影响因子：
56.9
通讯作者：
Han Zhao;Xingdu Qiao;Tianwei Wu;B. Midya;S. Longhi;Liang Feng
中科院分区：
文献类型：
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作者：
Han Zhao;Xingdu Qiao;Tianwei Wu;B. Midya;S. Longhi;Liang Feng
如何在拓扑学上定义光路，以鲁棒和灵活的方式控制光的流动将是下一代光子集成器件发展的关键。利用拓扑结构提供的固有保护，拓扑光子学为光的鲁棒传播提供了解决方案。然而，到目前为止，这些设备的功能都是固定的。Zhao等人创造了可以通过光学照明任意打开和关闭的光路。通过光学激发操纵光子结构内的增益和损耗区域，可以沿沿着期望的路径拓扑地操纵传播。该方法提供了一种在集成光学平台中控制拓扑保护光路的途径。科学，本期第1163页拓扑保护光路可以通过光学照明控制。光子拓扑绝缘体提供了一种抗无序光传输的途径，具有实际应用的前景。拓扑光路的灵活重新配置可以实现高密度光子路由，从而维持对数据容量不断增长的需求。通过战略接口的非厄米和拓扑物理，我们展示了任意的，强大的光转向可重构的非厄米结，其中手性拓扑状态可以在增益和损耗域的接口处传播。我们的非厄米控制的拓扑状态可以实现体内部光的鲁棒传输链路的动态控制，充分利用光子拓扑绝缘体的整个足迹。
How to define a light path topologically Controlling the flow of light in a robust and flexible manner will be critical for the development of the next generation of photonic integrated devices. Exploiting the inherent protection afforded by topology, topological photonics provides a solution for the robust propagation of light. Devices so far, however, have been fixed in their functionality. Zhao et al. created light paths that can be arbitrarily switched on and off by optical illumination. Propagation can be topologically steered along desired pathways by manipulating regions of gain and loss within the photonic structure through optical excitation. This approach provides a route to controlling topologically protected light paths in an integrated optical platform. Science, this issue p. 1163 Topologically protected light paths can be controlled through optical illumination. Photonic topological insulators provide a route for disorder-immune light transport, which holds promise for practical applications. Flexible reconfiguration of topological light pathways can enable high-density photonics routing, thus sustaining the growing demand for data capacity. By strategically interfacing non-Hermitian and topological physics, we demonstrate arbitrary, robust light steering in reconfigurable non-Hermitian junctions, in which chiral topological states can propagate at an interface of the gain and loss domains. Our non-Hermitian–controlled topological state can enable the dynamic control of robust transmission links of light inside the bulk, fully using the entire footprint of a photonic topological insulator.