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Nat Commun. 2015 Aug 27;6:8069. doi: 10.1038/ncomms9069.

Nonradiating anapole modes in dielectric nanoparticles.

Author information

1
Nonlinear Physics Centre, The Australian National University, Acton, Australian Capital Territory 2601, Australia.
2
Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany.
3
Institute of Laser and Information Technologies RAS, 142190 Moscow, Troitsk, Russia.
4
Data Storage Institute, A*STAR, 5 Engineering Drive 1, 117608, Singapore.
5
Technische Universität Darmstadt, Institut für Mikrowellentechnik und Photonik, Merckstraße 25, 64283 Darmstadt.
6
Saint-Petersburg Polytechnic University, Polytechnicheskaya 29, 195251 St Petersburg, Russia.

Abstract

Nonradiating current configurations attract attention of physicists for many years as possible models of stable atoms. One intriguing example of such a nonradiating source is known as 'anapole'. An anapole mode can be viewed as a composition of electric and toroidal dipole moments, resulting in destructive interference of the radiation fields due to similarity of their far-field scattering patterns. Here we demonstrate experimentally that dielectric nanoparticles can exhibit a radiationless anapole mode in visible. We achieve the spectral overlap of the toroidal and electric dipole modes through a geometry tuning, and observe a highly pronounced dip in the far-field scattering accompanied by the specific near-field distribution associated with the anapole mode. The anapole physics provides a unique playground for the study of electromagnetic properties of nontrivial excitations of complex fields, reciprocity violation and Aharonov-Bohm like phenomena at optical frequencies.

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