偶极子
物理
环面
多极展开
电场
磁偶极子
共振(粒子物理)
光场
量子电动力学
凝聚态物理
原子物理学
量子力学
等离子体
作者
Xu-Lin Zhang,Shubo Wang,Zhifang Lin,Hong‐Bo Sun,C. T. Chan
标识
DOI:10.1103/physreva.92.043804
摘要
We study the optical forces acting on toroidal nanostructures. A great enhancement of optical force is unambiguously identified as originating from the toroidal dipole resonance based on the source-representation, where the distribution of the induced charges and currents is characterized by the three families of electric, magnetic, and toroidal multipoles. On the other hand, the resonant optical force can also be completely attributed to an electric dipole resonance in the alternative field-representation, where the electromagnetic fields in the source-free region are expressed by two sets of electric and magnetic multipole fields based on symmetry. The confusion is resolved by conceptually introducing the irreducible electric dipole, toroidal dipole, and renormalized electric dipole. We demonstrate that the optical force is a powerful tool to identify toroidal response even when its scattering intensity is dwarfed by the conventional electric and magnetic multipoles.
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