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

Nonradiating anapole modes in dielectric nanoparticles.

Author information

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


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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