论文标题
二维拓扑激光器的边缘模式分叉
Edge mode bifurcations of two-dimensional topological lasers
论文作者
论文摘要
拓扑激光器越来越感兴趣，作为使用耦合谐振器阵列实现障碍单模式激光的一种方式。我们在二维耦合的谐振晶格中研究了激光，该谐振器晶格表现出微不足道和拓扑阶段之间的过渡，这使我们能够系统地表征整个拓扑阶段的激光模式。我们表明，与传统的拓扑鲁棒性不同，它需要足够大的散装带隙，即使最大化频带隙，也可能会发生拓扑边缘模式激光的分叉。我们表明，从单模式到多模式激光的线性模式分叉可能会在拓扑阶段深处，对泵的形状和晶格几何敏感。我们建议抑制这些分叉并保留单边模式激光的方法。
Topological lasers are of growing interest as a way to achieve disorder-robust single mode lasing using arrays of coupled resonators. We study lasing in a two-dimensional coupled resonator lattice exhibiting transitions between trivial and topological phases, which allows us to systematically characterize the lasing modes throughout a topological phase. We show that, unlike conventional topological robustness that requires a sufficiently large bulk band gap, bifurcations in topological edge mode lasing can occur even when the band gap is maximized. We show that linear mode bifurcations from single mode to multi-mode lasing can occur deep within the topological phase, sensitive to both the pump shape and lattice geometry. We suggest ways to suppress these bifurcations and preserve single edge mode lasing.
