论文标题
损失驱动的拓扑过渡
Loss-driven topological transitions in lasing
论文作者
论文摘要
我们通过实验观察到六聚体等离子晶状体中的激光，发现在调整单位电池的尺度时，发射的极化绕组会发生变化。通过理论分析，我们将激光模式识别为一个或两个拓扑电荷的连续性（准BICS）中的准结合状态。对结构的T-Matrix模拟表明，模式质量（Q）因子取决于单位单元格的尺度，其最高Q模式受激光偏爱。因此，该系统显示了在微不足道和高阶拓扑电荷模式下激光之间的损耗驱动的过渡。
We experimentally observe lasing in a hexamer plasmonic lattice and find that when tuning the scale of the unit cell, the polarization winding of the emission changes. By a theoretical analysis we identify the lasing modes as quasi bound states in continuum (quasi-BICs) of topological charges of zero, one or two. A T-matrix simulation of the structure reveals that the mode quality(Q)-factors depend on the scale of the unit cell, with highest-Q modes favored by lasing. The system thus shows a loss-driven transition between lasing in modes of trivial and high-order topological charge.
