Floquet topological insulator laser
Floquet topological insulator laser
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DOI：
10.1063/1.5121414
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发表时间：
2019-10
期刊：
影响因子：
5.6
通讯作者：
S. Ivanov;Yiqi Zhang;Y. Kartashov;D. Skryabin
中科院分区：
文献类型：
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作者：
S. Ivanov;Yiqi Zhang;Y. Kartashov;D. Skryabin
我们介绍一类基于光子 Floquet 拓扑绝缘体概念的拓扑激光器。所提出的系统被实现为激光螺旋波导的截断阵列，其中由于波导沿传播方向的扭曲而产生赝磁场，这打破了时间反转对称性并打开了拓扑间隙。当在阵列的边缘通道中提供足够的增益时，系统会进入拓扑边缘状态。拓扑激光仅在布洛赫动量的某些区间内稳定，这确保了线性放大和非线性吸收之间动态但稳定的平衡，从而导致呼吸边缘态的形成。我们还通过模拟晶格缺陷和波导的三角形排列来说明边缘电流的拓扑鲁棒性。
We introduce a class of topological lasers based on the photonic Floquet topological insulator concept. The proposed system is realized as a truncated array of the lasing helical waveguides, where the pseudo-magnetic field arises due to twisting of the waveguides along the propagation direction that breaks the time-reversal symmetry and opens up a topological gap. When sufficient gain is provided in the edge channels of the array then the system lases into the topological edge states. Topological lasing is stable only in certain intervals of the Bloch momenta, that ensure a dynamic, but stable balance between the linear amplification and nonlinear absorption leading to the formation of the breathing edge states. We also illustrate topological robustness of the edge currents by simulating lattice defects and triangular arrangements of the waveguides.