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Article Abstract
Based on two Bateman conjugate functions, a class of finite-energy spatiotemporally localized null electromagnetic fields in vacuum have been constructed. These wavepackets share with the basic Hopfion, as well as higher-order Hopf-Ranada solutions, topological properties dealing with linked and knotted electromagnetic field lines. Contrary to the Hopf-Ranada solutions, however, they are unidirectional and devoid of energy backflow, the latter being a counterintuitive phenomenon whereby, even for forward-propagating plane wave components, the energy locally propagates backward. Conservation laws for electromagnetic chirality and helicity for these novel wavepackets have been studied.
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| http://dx.doi.org/10.1364/OE.566938 | DOI Listing |
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