Magnetic switching of Kerker scattering in spherical microresonators
| Autor: | Konstantinos Baskourelos, Grigorios P. Zouros, Tomasz P. Stefanski, Evangelos Almpanis, Kosmas L. Tsakmakidis, Georgios D. Kolezas |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
business.industry Scattering QC1-999 Physics::Optics scattering-directionality switching 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Nanomaterials 010309 optics active tuning magneto-optical materials spherical microresonators 0103 physical sciences Optoelectronics Electrical and Electronic Engineering 0210 nano-technology business thz regime Biotechnology Magnetic switching |
| Zdroj: | Nanophotonics, Vol 9, Iss 12, Pp 4033-4041 (2020) |
| ISSN: | 2192-8614 2192-8606 |
| DOI: | 10.1515/nanoph-2020-0223 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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