Ma Xuekai, Kartashov Yaroslav V, Kavokin Alexey, Schumacher Stefan
Opt Lett. 2020 Oct 15;45(20):5700-5703. doi: 10.1364/OL.405400.
We model the generation of vortex modes in exciton-polariton condensates in semiconductor micropillars, arranged into a hexagonal ring molecule, in the presence of TE-TM splitting. This splitting lifts the degeneracy of azimuthally modulated vortex modes with opposite topological charges supported by this structure, so that a number of non-degenerate vortex states characterized by different combinations of topological charges in two polarization components appears. We present a full bifurcation picture for such vortex modes and show that because they have different energies they can be selectively excited by coherent pump beams with specific frequencies and spatial configurations. At high pumping intensity, polariton-polariton interactions give rise to the coupling of different vortex resonances and a bistable regime is achieved.
我们对半导体微柱中的激子 - 极化激元凝聚体中涡旋模式的产生进行建模，这些微柱排列成六边形环状分子，且存在TE - TM分裂。这种分裂消除了该结构所支持的具有相反拓扑电荷的方位角调制涡旋模式的简并性，从而出现了一些由两个偏振分量中拓扑电荷的不同组合所表征的非简并涡旋态。我们给出了此类涡旋模式的完整分岔图，并表明由于它们具有不同的能量，因此可以被具有特定频率和空间配置的相干泵浦光束选择性地激发。在高泵浦强度下，极化激元 - 极化激元相互作用导致不同涡旋共振的耦合，并实现了双稳态。
