期刊
PHYSICAL REVIEW A
卷 98, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.98.023858
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资金
- Ministry for Education and Science of the Russian Federation [K2-2016-051]
- Russian Foundation for Basic Research [16-32-50139, 16-02-00789]
- Russian Science Foundation [17-19-01786]
- DFG [CRC/TRR 191, CRC/TR 183]
- EPSRC [EP/M009122/1] Funding Source: UKRI
- Russian Science Foundation [17-19-01786] Funding Source: Russian Science Foundation
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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