Excitation of nonradiating magnetic anapole states with azimuthally polarized vector beams
Date
2018
Authors
Lamprianidis, Aristeides
Miroshnichenko, Andrey
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Publisher
Beilstein-Institut Zur Forderung der Chemischen Wissenschaften
Abstract
Nonradiating current configurations have been drawing the attention of the physics community for many years. It has been demonstrated recently that dielectric nanoparticles provide a unique platform to host such nonradiating modes, called "anapoles". Here we study theoretically the excitation of such exotic anapole modes in silicon nanoparticles using structured light. Alternative illumination configurations, properly designed, are able to unlock hidden behavior of scatterers. Particularly, azimuthally polarized focused beams enable us to excite ideal anapole modes of magnetic type in dielectric nanoparticles. Firstly, we perform the decomposition of this type of excitation into its multipolar content and then we employ the T-matrix method to calculate the far-field scattering properties of nanoparticles illuminated by such beams. We propose several configuration schemes where magnetic anapole modes of simple or hybrid nature can be detected in silicon nanospheres, nanodisks and nanopillars.
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Source
Beilstein Journal of Nanotechnology
Type
Journal article
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Access Statement
Open Access
License Rights
Creative Commons Attribution License
DOI
10.3762/bjnano.9.139