The role of plasma generated active species in the catalytic processes on metal oxide surfaces
Active plasma species are used in various surface related applications: decomposition of volatile hazardous species, synthesis of new compounds, activation of surfaces and deposition of films. The surface processes mediated by these plasma species are still poorly understood. in studies of plasma-assisted catalysis, usually only the gaseous species in the reactor outlet are registered but these species are formed both on catalyst surfaces and in gas phase. In present study we plan to apply in-situ methods e.g. DRIFTS and relate the results with transient studies of gas-phase products. In addition, new plasma sources for the production of specific active species are developed to investigate their effect on the surfaces (usually the plasma has a variety of species and it is not possible to discriminate their role). The studies give novel insight about the fundamental processes between plasma species and surfaces but also help to optimize these processes for industrial applications.
Principal investigator Dr Indrek Jõgi, Laboratory of Plasma Physics
Design and characterization of photonic structures and shaping of their spatio-temporal responses
Project's subject area is modern photonics. We combine material science, nano-optics and ultrafast optics to create photonic structures, design their response and to characterize it experimentally. For that we use a technique originally developed for measuring ultrabroadband pulses and is capable of retrieving the response with ultrahigh spatial and temporal resolution. We will study: a) thin film layer structures with nano- and micrometre dimensions, which act as metamaterials; b) one-dimensional photonic crystal to shape light field suitable for charged particle acceleration; c) specialty fibres for various applications in linear and nonlinear optics.
Principal investigator Dr Heli Valtna, Laboratory of Physical Optics