This work presents the process of creating laser-induced surface structures by fs laser radiation with circular polarization and the study of their optical properties by ellipsometry method. This report presents SEM images of the Cu and Cu/Au surfaces and the studies of spectral features of dielectric permittivity function and reflection coefficients of s- and p-polarized light.
In this paper, the plasmon resonance splitting on the anodized modified titanium has been studied. The plasmons absorption process in the permittivity functions spectra and reflectance spectra of p- and s-polarized light on the titanium oxide surface have been analyzed when the surface roughness parameters are changing. The surface roughness values were also estimated in this paper. Spectral features of the negative refractive index in the area of surface plasmon generation on the rough titanium-oxide film interface have been also presented in this paper. Surface roughness parameters are also determined. The upconversion luminescence enhancement of the ytterbium oxide on the rough titanium surface was observed in this work.
This paper presents the process of creating a gold surface modified by periodic structures deposited by femtosecond laser radiation by two different geometry. The refraction processes of s- and p-polarized light on the gold structured surfaces with the changes in the dielectric permittivity function were studied and compared in this paper. The presence of surface plasmon generation on the rough gold surface in visible region at two frequencies has been established in this work.
Optical properties (reflection, refractive index, real and imaginary part of permittivity function) of rough titanium surfaces fabricated by anodizing method at different anodic voltage have been studied. It is shown that a negative region in the visible wavelength range is observed on a rough titanium surface in the refractive index spectrum; its minimum appeared to be red-shifted shifted with surface roughness increase. These optical-nonlinear effects are studied by means s- and p-polarized light reflection coefficients spectra and permittivity spectra registration. It is also shown that the generation of surface plasmon oscillations in the visible spectral region on the rough titanium surface is possible. Excitation of surface plasmons is found to be accompanied by redistribution of the incident electromagnetic energy on the surface and leads to various nonlinear effects including negative values of the refractive index.
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