Gao Xinghui, Hu Wei, Schumacher Stefan, Ma Xuekai
Opt Lett. 2022 Jul 1;47(13):3235-3238. doi: 10.1364/OL.457724.
Vortices carrying quantized topological charges have potential applications in information processing. In this work, we investigate vortex carriers and waveguides in microcavity polariton condensates, nonresonantly excited by a homogeneous pump with intensity grooves. An intensity groove with a ring shape in the pump gives rise to dark-ring states of the condensate with a π-phase jump, akin to dark solitons. The dark-ring states can be destroyed by a stronger density of the surrounding condensate and reduce into vortex-antivortex pairs. Multiple vortex-pair states are found to be stable in the same dark ring of the pump. When the pump ring is broader, higher-order dark states with multiple π-phase jumps can be obtained, and interestingly they can be used to construct vortex waveguides. If a single vortex is imprinted in such waveguides, it can travel in a particular direction, showing one-way transportation. In other words, an imprinted vortex with a certain charge in a specifically designed higher-order dark state is only allowed to propagate unidirectionally.
携带量子化拓扑电荷的涡旋在信息处理方面具有潜在应用。在这项工作中，我们研究了微腔极化激元凝聚体中的涡旋载体和波导，它们由具有强度条纹的均匀泵浦非共振激发。泵浦中具有环形的强度条纹会产生具有π相位跃变的凝聚体暗环态，类似于暗孤子。暗环态会被周围凝聚体更强的密度破坏，并退化为涡旋 - 反涡旋对。发现多个涡旋对态在泵浦的同一暗环中是稳定的。当泵浦环更宽时，可以获得具有多个π相位跃变的高阶暗态，有趣的是它们可用于构建涡旋波导。如果在这样的波导中注入单个涡旋，它可以沿特定方向传播，表现出单向传输。换句话说，在专门设计的高阶暗态中具有特定电荷的注入涡旋仅被允许单向传播。
