Applications of the orbital angular momentum (OAM) of light range from the next generation of optical communication systems to optical imaging and optical manipulation of particles. Here we propose a micron-sized semiconductor source that emits light with predefined OAM pairs. This source is based on a polaritonic quantum fluid. We show how in this system modulational instabilities can be controlled and harnessed for the spontaneous formation of OAM pairs not present in the pump laser source. Once created, the OAM states exhibit exotic flow patterns in the quantum fluid, characterized by generation-annihilation pairs. These can only occur in open systems, not in equilibrium condensates, in contrast to well-established vortex-antivortex pairs.

中文翻译：

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极化量子流体中的光控轨道角动量生成

光的轨道角动量（OAM）的应用范围从下一代光通信系统到粒子的光学成像和光学操纵。在这里，我们提出了一种微米级的半导体源，它以预定义的OAM对发光。该源基于极化子量子流体。我们展示了在该系统中如何控制和控制调制不稳定性，以自发形成泵浦激光源中不存在的OAM对。一旦创建，OAM状态就会在量子流体中表现出奇异的流动模式，其特征是产生generation灭对。与成熟的涡旋-反涡旋对相反，它们只能在开放系统中发生，而不能在平衡冷凝物中发生。