Nonradiating anapole modes in dielectric nanoparticles

Page view(s)
12
Checked on Mar 25, 2024
Nonradiating anapole modes in dielectric nanoparticles
Title:
Nonradiating anapole modes in dielectric nanoparticles
Journal Title:
Nature Communications
Keywords:
Publication Date:
27 August 2015
Citation:
Nature Communications 6, Article number: 8069 (2015) doi:10.1038/ncomms9069
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.
License type:
http://creativecommons.org/licenses/by/4.0/
Funding Info:
Description:
ISSN:
2041-1723
Files uploaded: