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Nonlinear Plasmon, Rayleigh Scattering and Terahertz Dynamics in Phase-Change Correlated Oxides

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Technical Report,01 Sep 2015,31 Aug 2019

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University of Puerto Rico at Mayaguez Mayaguez Puerto Rico

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The major research objectives of this project are to investigate fundamental processes in ultrafast light-induced insulator-to-metal I-M and metal-to-insulator phase transition M-I PT dynamics in correlated vanadium oxides and elucidate the evolution of nonequilibrium phases upon photoexcitation. Different single-layer epitaxial films, multilayer plasmonic structures and also several phase-change oxide heterostructures will be synthesized during the program. The research effort is organized into three separate thrust areas 1 Synthesis of vanadium oxide thin films and complex multilayer structures 2 Time- and angle-resolved hemispherical elastic light scattering and surface plasmon-polariton SPP spectroscopy of photoexcited oxides 3 Time-domain terahertz spectroscopy The synthesis of a broad range of phase-change oxides, including highly nonlinear VO2, V2O3 complexes, is one of the major goals of the project. Pulsed laser deposition PLD and pulsed-dc magnetron sputtering techniques will be applied to prepare thin epitaxial and non-epitaxial films. While the main research focus of the project is centered on VO2 and V2O3 oxides, we also focus on the development of reliable protocols for the fabrication of V6O13, V3O5, V4O7, V5O9 and V6O11. The study of light-induced PT dynamics is applied for all successfully synthesized oxides. We note that the light-induced PT in V3O5, V4O7, V5O9, V6O11, V6O13 was never studied before and it is a completely unexplored phenomenon for these oxides. In order to elucidate pathways of excited state dynamics in vanadium oxide complexes, the research focuses on ultrafast light-induced PT dynamics in oxides with different stoichiometries and morphologies. Different methods of femtosecond spectroscopy will help to separate the charge and lattice dynamics upon PT and to reconstruct the evolution of electronic and structural material properties.

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics
  • Optics
  • Physical Chemistry

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