论文标题
观察拓扑边缘状态的非线性控制切换
Observation of nonlinearity-controlled switching of topological edge states
论文作者
论文摘要
我们报告了拓扑边缘状态的周期性切换之间的实验观察，在两个二聚体的FS-LASER书面波导阵列之间。切换是由于边缘状态的模态磁场从拓扑禁忌间隙的重叠而发生的，当时它们同时存在于两个阵列中，这是两个阵列近距离接近。我们发现，这种现象是强烈和弱局部边缘状态都发生的现象，并且随着拓扑阵列之间的间距的减小，切换速率会增加。当使拓扑阵列与非血管学阵列接触时，就不会发生拓扑间隙，而观察几乎固定的拓扑界面模式的形成或根据初始激发的位置形成了近乎固定的拓扑界面模式或强烈不对称的衍射。正如我们在不同的阵列间距上观察到的那样，可以控制拓扑阵列之间的切换，甚至可以通过增加输入信号的峰值功率来完全捕捉。
We report the experimental observation of the periodic switching of topological edge states between two dimerized fs-laser written waveguide arrays. Switching occurs due to the overlap of the modal fields of the edge states from topological forbidden gap, when they are simultaneously present in two arrays brought into close proximity. We found that the phenomenon occurs for both strongly and weakly localized edge states and that switching rate increases with decreasing spacing between the topological arrays. When topological arrays are brought in contact with nontopological ones, switching in topological gap does not occur, while one observes either the formation of nearly stationary topological interface mode or strongly asymmetric diffraction into the nontopological array depending on the position of the initial excitation. Switching between topological arrays can be controlled and even completely arrested by increasing the peak power of the input signal, as we observed with different array spacings.
