Magneto-optical engineering by plasmonic and dielectric metasurfaces in a CoFeB perforated microstructure

We have investigated theoretically and experimentally the effect of plasmonic and all-dielectric metasurfaces on the magneto-optical response of the 2D periodic structure. For this purpose, we fabricate polydimethylsiloxane-based 2D microstructures. So, we coated them with a gold layer and a TiO2 dielectric layer as plasmonic and dielectric metasurfaces, respectively, CoFeB as the prominent magneto-optical thin films. We record the spectral magneto -optical longitudinal Kerr effect under 40 mT, and the spectrometer's response in all visible regions. Our results show that the electric and magnetic dipole moments enhance the magneto-optical response by factors of one and two in two closer channels in 650 and 660 nm in an all-dielectric structure, respectively. The plasmonic hot spot -based magneto-optical enhancement is also confirmed in two other media with an enhancement factor of two.(c) 2023 Optica Publishing Group

Automated summary

In this study, the effect of plasmonic and all-dielectric metasurfaces on the magneto-optical response of a 2D periodic structure was investigated theoretically and experimentally. The results showed that the electric and magnetic dipole moments can significantly enhance the magneto-optical response in specific wavelength channels, and the magneto-optical enhancement based on plasmonic hot spots was confirmed.