Magnetic switching of Kerker scattering in spherical microresonators

Grigorios P. Zouros; Georgios D. Kolezas; Evangelos Almpanis; Konstantinos Baskourelos; Tomasz Stefański; Kosmas L. Tsakmakidis

doi:10.1515/nanoph-2020-0223

Magnetic switching of Kerker scattering in spherical microresonators

Abstract

Magneto-optical materials have become a key tool in functional nanophotonics, mainly due to their ability to offer active tuning between two different operational states in subwavelength structures. In the long-wavelength limit, such states may be considered as the directional forward- and back-scattering operations, due to the interplay between magnetic and electric dipolar modes, which act as equivalent Huygens sources. In this work, on the basis of full-wave electrodynamic calculations based on a rigorous volume integral equation (VIE) method, we demonstrate the feasibility of obtaining magnetically-tunable directionality inversion in spherical microresonators (THz antennas) coated by magneto-optical materials. In particular, our analysis reveals that when a high-index dielectric is coated with a magneto-optical material, we can switch the back-scattering of the whole particle to forward-scattering simply by turning off/on an external magnetic field bias. The validity of our calculations is confirmed by reproducing the above two-state operation, predicted by the VIE, with full-wave finite-element commercial software. Our results are of interest for the design of state-of-the-art active metasurfaces and metalenses, as well as for functional nanophotonic structures, and scattering and nanoantennas engineering.

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Authors (6)

Grigorios P. Zouros
Georgios D. Kolezas
Evangelos Almpanis
Konstantinos Baskourelos
Tomasz Stefański dr hab. inż.
Kosmas L. Tsakmakidis

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Category:: Articles
Type:: artykuły w czasopismach
Published in:: Nanophotonics no. 9, pages 4033 - 4041,
ISSN: 2192-8606
Language:: English
Publication year:: 2020
Bibliographic description:: Zouros G., Kolezas G., Almpanis E., Baskourelos K., Stefański T., Tsakmakidis K.: Magnetic switching of Kerker scattering in spherical microresonators// Nanophotonics -Vol. 9,iss. 12 (2020), s.4033-4041
DOI:: Digital Object Identifier (open in new tab) 10.1515/nanoph-2020-0223
Verified by:: Gdańsk University of Technology