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Nonlinear Optical Effects in Magnetic Plasmon Nanostructures
Safaa. M.R.H. Hussein and Alaa.G.K. Alshami
The purpose of the article was to study nonlinear optical and magnetic nonlinear optical effects, such as self-action of light, magnetic hyper-Rayleigh light scattering, magnetic nonlinear optical Kerr effect in magnetic plasmonic nanostructures and in magnetic Co/Au bilayer films on the silicon surface.
The features of optical second harmonic generation, the magnetic nonlinear optical Kerr effect, as well as the cubic effects of self-action of light in composite plasmonic nanostructures are studied. The study of the magnetic, optical, and nonlinear optical properties of such structures is relevant from the point of view of their use in magnetic recording devices, nano- and optoelectronics.
The dependence of the magnetic nonlinear optical properties on the thickness of the cobalt nanolayer in the Au/Co/Au structure has been studied. An enhancement of the magnetic nonlinear optical Kerr effect was found in the presence of granularity in the film. Spectroscopy of cubic effects of light self-action in magnetic plasmonic core/shell nanoparticles (iron oxide/gold) in a polymethyl methacrylate matrix was performed for the first time. An increase in the coefficients of nonlinear refraction and absorption in the plasmon resonance region is found. Magnetically induced effects were found in hyper-Rayleigh scattering at the second harmonic frequency (SH) in “core/shell” nanoparticles (iron oxide/gold). For the first time, generation of a coherent magnetically induced component of the SH was observed in a disordered ensemble of magnetic γ-Fe2O3 nanoparticles. It has been shown for the first time that there is a qualitative difference in the angular dependences of the amplitude and phase of the SH reflected from a two-dimensional ensemble of nano-disks (gold/cobalt/gold) and a similar continuous three-layer film.
Keywords: Nonlinear optical effects, optical Kerr effect, magnetic plasmonic nanostructures, nano- and optoelectronics, magnetic plasmonic nanoparticles, plasmon resonance