E-Locus - Institutional Repository of the University of Crete

Home Collections School/Department School of Sciences and Engineering Department of Materials Science and Technology Doctoral theses

Doctoral theses

Search command : Author="Κωνσταντινίδης" And Author="Κ." And Author="Θεόδωρος"

Current Record: 29 of 78

[Add to Basket]

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

Polymers

Διαλύματα πολυμερών

Μικροσκοπία

Πολυμερή

Φωτονικές συσκευές

Φωτοοξείδωση