文章基本信息

标题：Singularities in the flying electromagnetic doughnuts
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作者：Apostolos Zdagkas ; Nikitas Papasimakis ; Vassili Savinov 等
期刊名称：Nanophotonics
印刷版ISSN：2192-8606
电子版ISSN：2192-8614
出版年度：2019
卷号：8
期号：8
页码：1379-1385
DOI：10.1515/nanoph-2019-0101
出版社：Walter de Gruyter GmbH
摘要：Flying doughnuts (FDs) are exact propagating solutions of Maxwell equations in the form of single-cycle, space-time non-separable toroidal pulses. Here we review their properties and reveal the existence of a complex and robust fine topological structure. In particular, the electric and magnetic fields of the FD pulse vanish across a number of planes, spherical shells and rings, and display a number of point singularities including saddle points and vortices. Moreover, the instantaneous Poynting vector of the field exhibits a large number of singularities, which are often accompanied by extended areas energy backflow.
关键词：toroidal pulse ; toroidal electrodynamics ; flying doughnut ; topology ; vortex ; singularities