Zhang Ni, Lei Xinrui, Liu Jiachen, Zhan Qiwen
Opt Express. 2023 Sep 11;31(19):30020-30029. doi: 10.1364/OE.498456.
With the characteristics of ultrasmall, ultrafast, and topological protection, optical skyrmions are great prospects for applications in high intensity data stroage, high resolution microscopic imaging, and polarization sensing. Flexible control over the topology of optical skyrmions is required for practical implementation/application. At present, the manipulation of optical skyrmions usually relies upon the change of spatial structure, which results in a limited-tuning range and a discontinuous control in the parameter space. Here, we propose continuous manipulation of the graphene plasmon skyrmions based on the electrotunable properties of graphene. By changing the Fermi energy of one pair of the standing waves or the phase of incident light, one can achieve topological state transformation of graphene plasmon skyrmions, which is evident by the change of skyrmion number from 1 to 0.5. The direct manipulation of the graphene plasmon skyrmions is demonstrated by simulation results based on the finite element method. Our work suggests a feasible way to flexibly control the topology of an optical skyrmionic field, which can be used for novel integrated photonic devices in the future.
具有超小、超快和拓扑保护特性的光学斯格明子在高强度数据存储、高分辨率显微成像和偏振传感等应用方面具有广阔前景。实际应用需要对光学斯格明子的拓扑结构进行灵活控制。目前，光学斯格明子的操控通常依赖于空间结构的变化，这导致调谐范围有限且在参数空间中控制不连续。在此，我们基于石墨烯的电可调特性提出对石墨烯等离子体斯格明子进行连续操控。通过改变一对驻波的费米能或入射光的相位，可以实现石墨烯等离子体斯格明子的拓扑态转变，斯格明子数从1变为0.5就证明了这一点。基于有限元方法的模拟结果展示了对石墨烯等离子体斯格明子的直接操控。我们的工作提出了一种灵活控制光学斯格明子场拓扑结构的可行方法，未来可用于新型集成光子器件。
