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  • PhysRevLett.125.063201

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  • PhysRevLett.125.063201.supplemental

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Radiative Toroidal Dipole and Anapole Excitations in Collectively Responding Arrays of Atoms

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
Article number063201
<mark>Journal publication date</mark>7/08/2020
<mark>Journal</mark>Physical review letters
Issue number6
Volume125
Number of pages7
Publication StatusPublished
Early online date4/08/20
<mark>Original language</mark>English

Abstract

A toroidal dipole represents an often overlooked electromagnetic excitation distinct from the standard electric and magnetic multipole expansion. We show how a simple arrangement of strongly radiatively coupled atoms can be used to synthesize a toroidal dipole where the toroidal topology is generated by radiative transitions forming an effective poloidal electric current wound around a torus. We extend the protocol for methods to prepare a delocalized collective excitation mode consisting of a synthetic lattice of such toroidal dipoles and a nonradiating, yet oscillating charge-current configuration, dynamic anapole, for which the far-field radiation of a toroidal dipole is identically canceled by an electric dipole.

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© 2020 American Physical Society