Abstract
The magneto-optical properties of surface-plasmon polaritonic crystals on ferromagnetic substrates have been studied. The resonant optical transmission of such magneto-plasmonic nanostructures can be efficiently controlled with the applied static magnetic field. The effect is explained by the influence of magneto-optical effects on surface-plasmon polariton waves supported by the metal/magnetic–dielectric interface and, in particular, on the plasmonic bandgap formation.
Highlights
The transmission spectra of the magneto-plasmonic crystals under investigation are determined by the transmission of the IG film and the transmission of the nanostructured Au film related to plasmonic resonances
Due to the relatively high refractive index of the substrate compared to the air superstrate, SPP Bloch modes on Au/air and Au/IG interfaces are significantly spectrally separated at normal incidence
Based on the estimations of the SPP modes in the model of an almost empty lattice [18], the transmission resonances observed in the visible spectral range (figure 2(a)) can be assigned to the scattering of photons due to the (1,1) and (2,0) SPP Bloch modes on the Au/IG interface [3]
Summary
The magneto optical response of an IG film in the polar (p) configuration, when the external magnetic field is normal to the interface, longitudinal (l) or transversal (t) configurations when the magnetic field is in the plane of the interface and in the direction of SPP propagation or perpendicular to it, respectively, is described by the permittivity tensor [16] Magneto-optical Kerr-effect (MOKE) spectroscopic ellipsometry (the measurements of rotation and ellipticity of the reflected light) was performed in reflection at near normal incidence (figure 1(d)).
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