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Doctoral theses

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Identifier 000427238
Title Light-induced patterning in polydiene solutions.
Alternative Title Δημιουργία φωτοεπαγώμενων δομών σε διάλυματα
Author Μπόγρης, Αθανάσιος
Thesis advisor Φυτάς, Γεώργιος
Reviewer Βλασσόπουλος, Δημήτριος
Loppinet, Benoit
Πετεκίδης , Γεώργιος
Μακρής, Κωνσταντίνος
Πισσαδάκης, Σταύρος
Πίσπας, Αστέριος
Abstract The subject of the present work is the study of the unanticipated response of common (but specific) polymer solutions (polybutadiene and polyisoprene in a variety of solvents) to red light laser irradiation. Mild red laser irradiation leads to a local change of the refractive index and the formation of microstructures along the direction of beam propagation. We try to establish the phenomenology of the effect, reproduce by means of numerical simulations the response of solutions to irradiation, discover the origin of the response and explore possible practical applications of the effect. To do so, we investigate the dependence of the response on conditions like the solvent environment, the irradiation conditions, and the effect of other physico-chemical parameters, such as polymer microstructure and molecular weight or even the presence of dissolved oxygen in the solutions. We characterize the irradiated structures materials through spectroscopy to observe possible changes in microstructure. Based on the spectroscopic results, which point towards discernible changes in the material and the possibility of photo-reactive type of process, we propose a possible chemical mechanism. Finally, we investigate possibilities offered by these materials in terms of patterning application and in terms of device making use of the self-written waveguides
Language English
Subject Microscopy
Photonic devices
Polymer solutions
Διαλύματα πολυμερών
Φωτονικές συσκευές
Issue date 2020
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Materials Science and Technology--Doctoral theses
  Type of Work--Doctoral theses
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