Electromagnetic anapoles of a Cartesian expansion of localized electric currents

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Abstract

Electromagnetic anapoles are nonradiating oscillations of electric charge. They are known to be formed by a combination of an ordinary and a toroidal multipole. In this work, we introduce a different family of anapoles based on a Cartesian electric-current multipole expansion and propose a way to create the lowest-order, centrosymmetric member of this family. We also find a nontoroidal multipole structure that radiates as an electric dipole despite its zero total dipole moment. Radiation-free charge oscillations are interesting not only in view of their unique fundamental properties, but also in view of practical applications, e.g., in near-field-based optical sensing and detection.
Original languageEnglish
Article number042043
Pages (from-to)1-5
Number of pages5
JournalPHYSICAL REVIEW RESEARCH
Volume2
Issue number4
DOIs
Publication statusPublished - 18 Dec 2020
MoE publication typeA1 Journal article-refereed

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