论文标题
纳米级拓扑角状态的非线性成像
Nonlinear imaging of nanoscale topological corner states
论文作者
论文摘要
光的拓扑状态代表了在有限大小的光学结构边界的违反直觉的光学模式，该光学模式源自大块的性质。由于由散装特性定义，这种边界状态对某些类型的扰动不敏感，因此自然增强了光子电路的鲁棒性。通常，n维散装模式对应于（n-1）维边界状态。高阶的体积对应关系将n维大容量与边界状态相关联，维度降低了1个以上。一种特殊的兴趣在于，这种高阶拓扑状态的微型化为纳米级。在这里，我们认识到具有C6对称蜂窝晶格的元时间的纳米级拓扑角状态。我们直接观察到纳米级拓扑授权的边缘和光的角度局部以及通过非线性成像技术增强光结合的相互作用。拓扑授权的纳米级的光的控制可能有助于促进经典和量子光子设备的微型化和芯片整合。
Topological states of light represent counterintuitive optical modes localized at boundaries of finite-size optical structures that originate from the properties of the bulk. Being defined by bulk properties, such boundary states are insensitive to certain types of perturbations, thus naturally enhancing robustness of photonic circuitries. Conventionally, the N-dimensional bulk modes correspond to (N-1)-dimensional boundary states. The higher-order bulk-boundary correspondence relates N-dimensional bulk to boundary states with dimensionality reduced by more than 1. A special interest lies in miniaturization of such higher-order topological states to the nanoscale. Here, we realize nanoscale topological corner states in metasurfaces with C6-symmetric honeycomb lattices. We directly observe nanoscale topology-empowered edge and corner localizations of light and enhancement of light-matter interactions via a nonlinear imaging technique. Control of light at the nanoscale empowered by topology may facilitate miniaturization and on-chip integration of classical and quantum photonic devices.
