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Abstract
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.
Highlights
Following an increasing need for the deployment of active photonic materials during recent years, magnetooptical-aided dielectric resonators have emerged as a valuable platform because of their unique and energyefficient ability to control the propagation of optical waves
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 magnetooptical materials
Our analysis reveals that when a high-index dielectric is coated with a magnetooptical material, we can switch the back-scattering of the whole particle to forward-scattering by turning off/ on an external magnetic field bias
Summary
Following an increasing need for the deployment of active (tunable) photonic materials during recent years, magnetooptical-aided dielectric resonators have emerged as a valuable platform because of their unique and energyefficient ability to control the propagation of optical waves. This is achieved through an external agent, mainly an external magnetic field, which alters the constitutive parameters of the magneto-optical material. Magneto-optical materials have been successfully employed in cylindrical structures, such as infinite cylinders or arrays of such Their use was recently achieved in the context of active scattering, via the available Mie theory for infinite, two-dimensional circular gyroelectric/gyromagnetic cylinders whose solution can be separated into TE and TM modes [2]. Active control of directional scattering with a core–shell infinite cylinder driven by an
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