Zhao Xinying, Liang Huijian, Ren Liyong, Pang Xiaoyan
Opt Lett. 2024 Oct 1;49(19):5391-5394. doi: 10.1364/OL.537923.
The optical skyrmion and its topological behavior are analyzed in an energy flux field constructed by an X-type vortex in a high numerical aperture system. The conditions for the formation of a skyrmion structure in this field are discussed, showing that the vortex pattern of the transverse energy flow and the inverse energy flow are crucial for the skyrmions and also are controlled by the phase gradient of the X-type vortex. Notably, the "zipper-like" topological reaction, which is the first, to our knowledge, found in ferromagnetic materials, is observed, and the physical mechanism is also explained by the relation of orbital angular momentum density and Poynting vectors. The results will reach the topological theory and may have applications in optical traps and data storage.
在高数值孔径系统中，对由X型涡旋构建的能量流场中的光学斯格明子及其拓扑行为进行了分析。讨论了该场中形成斯格明子结构的条件，表明横向能量流和反向能量流的涡旋模式对斯格明子至关重要，并且也由X型涡旋的相位梯度控制。值得注意的是，观察到了“拉链状”拓扑反应，据我们所知，这是在铁磁材料中首次发现的，并且其物理机制也通过轨道角动量密度与坡印廷矢量的关系进行了解释。这些结果将完善拓扑理论，并可能在光阱和数据存储中得到应用。
