Spin-Momentum-Locked Edge Mode for Topological Vortex Lasing.,Physical Review Letters

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Spin-Momentum-Locked Edge Mode for Topological Vortex Lasing.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-01 , DOI: 10.1103/physrevlett.125.013903
Zhen-Qian Yang _{1,

2} , Zeng-Kai Shao _{1,

2} , Hua-Zhou Chen _{1,

2} , Xin-Rui Mao _{1,

2} , Ren-Min Ma _{1,

2}

Affiliation

Spin-momentum locking is a direct consequence of bulk topological order and provides a basic concept to control a carrier’s spin and charge flow for new exotic phenomena in condensed matter physics. However, up to date the research on spin-momentum locking solely focuses on its in-plane transport properties. Here, we report an emerging out-of-plane radiation feature of spin-momentum locking in a non-Hermitian topological photonic system and demonstrate a high performance topological vortex laser based on it. We find that the gain saturation effect lifts the degeneracy of the paired counterpropagating spin-momentum-locked edge modes enabling lasing from a single topological edge mode. The near-field spin and orbital angular momentum of the topological edge mode lasing has a one-to-one far-field radiation correspondence. The methodology of probing the near-field topology feature by far-field lasing emission can be used to study other exotic phenomena. The device can lead to applications in superresolution imaging, optical tweezers, free-space optical sensing, and communication.

中文翻译：

拓扑涡旋激光的自旋动量锁定边缘模式。

自旋动量锁定是体拓扑有序的直接结果，并为控制凝聚态物理中新奇特现象的载流子自旋和电荷流提供了基本概念。然而，迄今为止对自旋动量锁定的研究仅集中在其面内传输特性上。在这里，我们报告了非厄米拓扑光子系统中自旋动量锁定的平面外辐射特征，并展示了基于它的高性能拓扑涡旋激光器。我们发现增益饱和效应提升了成对反向传播自旋动量锁定边缘模式的简并性，从而能够从单个拓扑边缘模式发射激光。拓扑边缘模式激光的近场自旋和轨道角动量具有一一对应的远场辐射对应关系。通过远场激光发射探测近场拓扑特征的方法可用于研究其他奇异现象。该器件可用于超分辨率成像、光镊、自由空间光学传感和通信。

更新日期：2020-07-01

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