Deng Zi-Lan, Shi Tan, Krasnok Alex, Li Xiangping, Alù Andrea
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, 510632, China.
Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY, 10031, USA.
Nat Commun. 2022 Jan 10;13(1):8. doi: 10.1038/s41467-021-27710-w.
Optical skyrmions have recently been constructed by tailoring vectorial near-field distributions through the interference of multiple surface plasmon polaritons, offering promising features for advanced information processing, transport and storage. Here, we provide experimental demonstration of electromagnetic skyrmions based on magnetic localized spoof plasmons (LSP) showing large topological robustness against continuous deformations, without stringent external interference conditions. By directly measuring the spatial profile of all three vectorial magnetic fields, we reveal multiple π-twist target skyrmion configurations mapped to multi-resonant near-equidistant LSP eigenmodes. The real-space skyrmion topology is robust against deformations of the meta-structure, demonstrating flexible skyrmionic textures for arbitrary shapes. The observed magnetic LSP skyrmions pave the way to ultra-compact and robust plasmonic devices, such as flexible sensors, wearable electronics and ultra-compact antennas.
光学斯格明子最近通过多个表面等离激元极化激元的干涉来定制矢量近场分布而构建出来，为先进的信息处理、传输和存储提供了有前景的特性。在此，我们提供了基于磁局域类表面等离激元（LSP）的电磁斯格明子的实验演示，其显示出对连续变形具有很大的拓扑鲁棒性，且无需严格的外部干涉条件。通过直接测量所有三个矢量磁场的空间分布，我们揭示了映射到多共振近等距LSP本征模的多个π扭转目标斯格明子构型。实空间中的斯格明子拓扑对亚结构的变形具有鲁棒性，展示了用于任意形状的灵活斯格明子纹理。所观察到的磁LSP斯格明子为超紧凑且鲁棒的等离子体器件铺平了道路，例如柔性传感器、可穿戴电子产品和超紧凑天线。
