Nanocomposite materials based on noble metal nanoparticles have recently attracted the interest of both researchers and engineers. The reason lies in the unique optical properties of such materials. Thanks to nanoparticles with a pronounced frequency dependence of the dielectric constant, the nanocomposite of such particles in a dielectric matrix acquires the properties of a resonant medium. In such a medium, collective excitations such as bulk and surface polaritons are possible. For a model of a nanocomposite, consisting of nanoparticles of noble metals, uniformly distributed in a dielectric matrix, the dielectric constant is plotted. The analysis of ellipsometric parameters at reflection from the nanocomposite of a wave of linear polarization is carried out.
The analysis of the parameters of the polarization of laser radiation upon reflection from a plate of a uniaxial crystal showed that such a plate can convert the polarization of the incident radiation. As the latter, we used circularly polarized laser radiation at a wavelength of λ = 0.64 μm. With a change in the angle of incidence of radiation, the reflected polarization changed from circularly polarized to elliptical. In this case, the tilt angle of the major semiaxis of the polarization ellipse changed from negative to positive values. The direction of rotation of the field vector also changed from right circular to left elliptical, passing through linear polarization. An increase in the thickness of the anisotropic plate intensified the effect of wave interference in it - all changes in the polarization parameters with a change in the angle of incidence of radiation occurred more often than with a thinner plate. The analysis of ellipsometric parameters is carried out when circularly polarized laser radiation is incident on an anisotropic plate and the angular spectra of these parameters are obtained when light is reflected from the plate. The results obtained can be used to design polarization converters based on an anisotropic plate.
The paper discusses the use of a laser wave of elliptical and circular polarization under ATR conditions. It is shown that when a wave of right circular polarization is incident on an object under study, a change in the nature of polarization occurs when scanning the angle of incidence — from the right elliptical, through the linear to the left elliptical. The analysis of the parameters of the ellipse and ellipsometric parameters during the incidence of a circularly polarized wave on a layered prism-metal-air and prism-metal-bioobject-air structure according to the Kretschman scheme under the condition of excitation of surface plasmons is carried out. For the first time, the characteristic shifts between the minima of the eliipsometric parameters and the parameters of the ellipse of polarization of reflected light, carrying information about the object under study, were calculated. It is also shown for the first time that for these parameters the maxima of the ellipsometry parameter and the ellipse parameter shift, which is responsible for the eccentricity and direction of rotation of the field vector along the polarization ellipse. The results obtained expand the scope of plasmon resonance spectroscopy to the more general case of elliptically polarized light.
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