Electromagnetic anapoles of a Cartesian expansion of localized electric currents

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2020-12-18
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en
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5
1-5
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PHYSICAL REVIEW RESEARCH, Volume 2, issue 4
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.
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Shevchenko , A , Vashistha , V , Kaivola , M & Nyman , M 2020 , ' Electromagnetic anapoles of a Cartesian expansion of localized electric currents ' , PHYSICAL REVIEW RESEARCH , vol. 2 , no. 4 , 042043 , pp. 1-5 . https://doi.org/10.1103/PhysRevResearch.2.042043