All-dielectric magnetic metasurface for advanced light control in dual polarizations combined with high-Q resonances
| Autor: | Miguel Levy, Andrey A. Voronov, Daria O. Ignatyeva, Dolendra Karki, Mikhail A. Kozhaev, Vladimir I. Belotelov, Alexander I. Chernov, D. M. Krichevsky |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Kerr effect Science General Physics and Astronomy Physics::Optics 02 engineering and technology 01 natural sciences General Biochemistry Genetics and Molecular Biology Article Magnetization Condensed Matter::Materials Science Magnetic properties and materials 0103 physical sciences lcsh:Science Plasmon Nanopillar 010302 applied physics Nanophotonics and plasmonics Multidisciplinary business.industry Metamaterial General Chemistry 021001 nanoscience & nanotechnology Light intensity Modulation Metamaterials Optoelectronics lcsh:Q Magneto-optics 0210 nano-technology business Intensity modulation |
| Zdroj: | Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020) Nature Communications |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-020-19310-x |
| Popis: | Nanostructured magnetic materials provide an efficient tool for light manipulation on sub-nanosecond and sub-micron scales, and allow for the observation of the novel effects which are fundamentally impossible in smooth films. For many cases of practical importance, it is vital to observe the magneto-optical intensity modulation in a dual-polarization regime. However, the nanostructures reported on up to date usually utilize a transverse Kerr effect and thus provide light modulation only for p-polarized light. We present a concept of a transparent magnetic metasurface to solve this problem, and demonstrate a novel mechanism for magneto-optical modulation. A 2D array of bismuth-substituted iron-garnet nanopillars on an ultrathin iron-garnet slab forms a metasurface supporting quasi-waveguide mode excitation. In contrast to plasmonic structures, the all-dielectric magnetic metasurface is shown to exhibit much higher transparency and superior quality-factor resonances, followed by a multifold increase in light intensity modulation. The existence of a wide variety of excited mode types allows for advanced light control: transmittance of both p- and s-polarized illumination becomes sensitive to the medium magnetization, something that is fundamentally impossible in smooth magnetic films. The proposed metasurface is very promising for sensing, magnetometry and light modulation applications. The authors fabricate and investigate the metasurface made of 2D iron-garnet subwavelength nanopillar array on a thin iron-garnet film. It exhibits high quality-factor resonances, leading to a multifold increase in light intensity modulation of the transmitted light with an advantage of P and S polarizations both sensitive to the medium magnetization. |
| Databáze: | OpenAIRE |
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