Chen Peiyang, Lee Kai Xiang, Meiler Tim Colin, Shen Yijie
Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore.
School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
Nanophotonics. 2025 May 5;14(12):2211-2217. doi: 10.1515/nanoph-2025-0071. eCollection 2025 Jun.
How topologies play a role in light-matter interaction is of great interest in control and transfer of topologically-protected structures. These topological structures such as skyrmions and merons have not yet been found in canonical momentum fields, which are fundamental in mechanical transfer between optical and matter fields. Here, we reveal the universality of generating skyrmionic structures in the canonical momentum of light in multipole Mie scattering fields. We demonstrate the distinct topological stability of canonical momentum skyrmions and merons, and compare with well-studied Poynting vector and optical spin fields. The study of these fields allow for a clean and direct approach to measuring and quantifying energetic structures in optical fields, through observable radiation pressure. Our work lays the foundation for exploring new topologically nontrivial phenomena in optical forces, metamaterial design, and light-matter interaction.
拓扑结构如何在光与物质相互作用中发挥作用，这在拓扑保护结构的控制和转移方面具有极大的研究价值。这些拓扑结构，如斯格明子和磁单极子，在规范动量场中尚未被发现，而规范动量场在光场与物质场之间的机械转移中至关重要。在此，我们揭示了在多极米氏散射场中光的规范动量产生斯格明子结构的普遍性。我们展示了规范动量斯格明子和磁单极子独特的拓扑稳定性，并与经过充分研究的坡印廷矢量和光学自旋场进行了比较。对这些场的研究使得通过可观测的辐射压力，能够以一种清晰直接的方式测量和量化光场中的能量结构。我们的工作为探索光力、超材料设计和光与物质相互作用中的新拓扑非平凡现象奠定了基础。
