Aldama-Guardia, Jennifer D.

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    Light scattering and surface plasmon polaritons in thin films of phase-change materials
    (2018-12-11) Aldama-Guardia, Jennifer D.; Lysenko, Sergiy; College of Arts and Sciences - Sciences; Romañach, Rodolfo; Fernández, Felix; Department of Physics; Ierkic, H. Mario
    Optical methods, such as measurements of angle-resolved elastic light scattering and light reflection, are rapid and noncontact techniques for the study of optical and statistical properties of surfaces. In this work, the objects of study were plasmonic structures based on Au, VO2, and VO2/Au thin films, and highly-dispersed granular materials. In this project, Kretschmann-Raether configuration in attenuated total reflection geometry was used to excite surface plasmon-polaritons (SPPs) on the film surface. Angle-resolved light scattering and light-induced plasmonic switching in thin films of phase-change materials were studied. In order to do that, steady-state and time-resolved measurements were performed. It was found that SPP resonance depends on light wavelength, film thickness, and optical properties. Moreover, the VO2 layer on Au film alters the electromagnetic field enhancement. On the other hand, time-resolved measurements showed SPP resonance on a picosecond timescale. In the present work, we also applied angle-resolved light diffraction techniques to elucidate the fundamental properties of light diffraction by highly-dispersed granular materials. The main objective of this study was to develop new analytical techniques to separate multiple and single scattering components in spatial distribution of scattered light and to find relations between characteristics of scattered light and internal structure of materials with high level of structural disorder. Particularly, fractal and polarization analysis were performed to describe the surface morphology and optical properties of granular compositions and to classify compounds with different concentrations of active ingredients. Special attention was focused on the determination of low-dose concentration of chemically active (pharmaceutical) ingredients.