Ma Xuekai, Berger Bernd, Aßmann Marc, Driben Rodislav, Meier Torsten, Schneider Christian, Höfling Sven, Schumacher Stefan
Department of Physics and Center for Optoelectronics and Photonics Paderborn (CeOPP), Universität Paderborn, Warburger Strasse 100, 33098, Paderborn, Germany.
Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany.
Nat Commun. 2020 Feb 14;11(1):897. doi: 10.1038/s41467-020-14702-5.
Vortices are topological objects representing the circular motion of a fluid. With their additional degree of freedom, the vorticity, they have been widely investigated in many physical systems and different materials for fundamental interest and for applications in data storage and information processing. Vortices have also been observed in non-equilibrium exciton-polariton condensates in planar semiconductor microcavities. There they appear spontaneously or can be created and pinned in space using ring-shaped optical excitation profiles. However, using the vortex state for information processing not only requires creation of a vortex but also efficient control over the vortex after its creation. Here we demonstrate a simple approach to control and switch a localized polariton vortex between opposite states. In our scheme, both the optical control of vorticity and its detection through the orbital angular momentum of the emitted light are implemented in a robust and practical manner.
涡旋是代表流体圆周运动的拓扑对象。由于其额外的自由度——涡度，它们已在许多物理系统和不同材料中得到广泛研究，以满足基本研究兴趣以及在数据存储和信息处理中的应用需求。在平面半导体微腔中的非平衡激子 - 极化激元凝聚体中也观察到了涡旋。在那里，它们会自发出现，或者可以使用环形光学激发轮廓在空间中创建并固定。然而，将涡旋态用于信息处理不仅需要创建涡旋，还需要在其创建后对涡旋进行有效控制。在此，我们展示了一种简单的方法来控制局域极化激元涡旋并在相反状态之间进行切换。在我们的方案中，通过发射光的轨道角动量对涡度进行光学控制及其检测都以稳健且实用的方式得以实现。
