Electromagnetic sources beyond common multipoles

被引：33
|
作者：
Nemkov, Nikita A. [1 ,2 ]
Basharin, Alexey A. [1 ]
Fedotov, Vassili A. [3 ]
机构：
[1] Natl Univ Sci & Technol MISiS, Lab Superconducting Metamat, Moscow 119049, Russia
[2] Univ Cologne, Math Inst, Weyertal 86-90, D-50931 Cologne, Germany
[3] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England
来源：
PHYSICAL REVIEW A | 2018年 / 98卷 / 02期
基金：
英国工程与自然科学研究理事会; 俄罗斯基础研究基金会; 俄罗斯科学基金会;
关键词：
NANOPARTICLES; FIELDS;
D O I：
10.1103/PhysRevA.98.023858
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The complete dynamic multipole expansion of electromagnetic sources contains more types of multipole terms than is conventionally perceived. The toroidal multipoles are one of the examples of such contributions that have been widely studied in recent years. Here we inspect more closely the other type of commonly overlooked terms known as the mean-square radii. In particular, we discuss both quantitative and qualitative aspects of the mean-square radii and provide a general geometrical framework for their visualization. We also consider the role of the mean-square radii in expanding the family of nontrivial nonradiating electromagnetic sources.
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页数：9
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