Anapole electric dipole modes for a dielectric sphere

Авторы: Ponomareva S.R., Gurvitz Egor A., Ladutenko Konstantin, Miroshnichenko Andrey E., Shalin Alexander S.
Сборник: American Institute of Physics Inc
Том: 2300
Год издания: 2020
Издательство: Australian Institute of Physics
Местоположение издательства: Australia
DOI: 10.1063/5.0032562
Аннотация: In this work, we consider resonant anapole state of an electric dipole in a dielectric spherical particle. The analytical expression that describes the minimum size parameter of a resonant state at a given refractive index of the scatterer was shown. Using Cartesian multipole decomposition, we reveal the resonant anapole state does consist of the basic electric dipole and a minimum contribution of 7 resonant toroidal moments. It was shown that the presence of vortex- like configurations indicates the appearance of toroidal moments in the scattering spectra. Interestingly, with the correct description of electric dipole anapole state, increasing number of singularities in the near-field region that is associated with the increase of refractive index doesn’t change the minimum set of toroidal moments. © 2020 Author(s).
Добавил в систему: Шалин Александр Сергеевич

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