Wu Yunkun, Wang Shu, Lei Xinrui, Mao Jiahui, Lu Liu, Liu Yue, Qu Guangyuan, Sun Fangwen, Guo Guangcan, Zhan Qiwen, Ren Xifeng
CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China.
CAS Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China.
Nano Lett. 2025 Jul 2;25(26):10369-10375. doi: 10.1021/acs.nanolett.5c01653. Epub 2025 Jun 3.
Topologically protected optical quasiparticles have garnered growing research interest due to their capacity to provide a novel degree of freedom for manipulating light-matter interactions while demonstrating significant potential in nanometrology and ultrafast vector imaging. However, the characterization of the full 3D vectorial structures of the topological textures at the nanoscale has remained challenging. We present a fiber taper-silver nanowire waveguide probe to achieve subwavelength mapping of the topological textures. Based on the selective plasmonic-optical mode coupling principle, the three orthogonal electric-field components in both the far field and the near field are directly collected and reconstructed without the need for postprocessing algorithms, enabling the visualization of topological textures formed in both free space and evanescent waves. The fiber-integrated probe further demonstrates broadband operation and mechanical robustness. This approach offers promising prospects for analyzing sophisticated optical-field topologies with potential advanced applications in optical data storage and information processing systems.
由于拓扑保护的光学准粒子能够为操纵光与物质的相互作用提供一种全新的自由度，同时在纳米计量学和超快矢量成像方面展现出巨大潜力，因此其已引起越来越多的研究关注。然而，在纳米尺度上对拓扑纹理的完整三维矢量结构进行表征仍然具有挑战性。我们提出了一种光纤锥 - 银纳米线波导探针，以实现拓扑纹理的亚波长映射。基于选择性等离子体 - 光学模式耦合原理，无需后处理算法即可直接收集和重建远场和近场中的三个正交电场分量，从而能够可视化在自由空间和倏逝波中形成的拓扑纹理。这种光纤集成探针还展示了宽带操作和机械鲁棒性。该方法为分析复杂的光场拓扑结构提供了广阔前景，在光学数据存储和信息处理系统中具有潜在的先进应用。
