Nonradiating anapole modes in dielectric nanoparticles

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Nonradiating anapole modes in dielectric nanoparticles
Nonradiating anapole modes in dielectric nanoparticles
Journal Title:
Nature Communications
Publication Date:
27 August 2015
Nature Communications 6, Article number: 8069 (2015) doi:10.1038/ncomms9069
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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