Rights statement: © 2020 American Physical Society
Accepted author manuscript, 2.29 MB, PDF document
Available under license: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License
Rights statement: © 2020 American Physical Society
Final published version, 489 KB, PDF document
Final published version, 394 KB, PDF document
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Radiative Toroidal Dipole and Anapole Excitations in Collectively Responding Arrays of Atoms
AU - Ballantine, Kyle
AU - Ruostekoski, Janne
N1 - © 2020 American Physical Society
PY - 2020/8/7
Y1 - 2020/8/7
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.125.063201
DO - 10.1103/PhysRevLett.125.063201
M3 - Journal article
VL - 125
JO - Physical review letters
JF - Physical review letters
SN - 1079-7114
IS - 6
M1 - 063201
ER -