Dissertation
TESTING A GENERALIZED DOMAIN MODEL OF PHOTODEGRADATION AND SELF- HEALING USING NOVEL OPTICAL CHARACTERIZATION TECHNIQUES AND THE EFFECTS OF AN APPLIED ELECTRIC FIELD
Doctor of Philosophy (PhD), Washington State University
01/2013
Handle:
https://hdl.handle.net/2376/5026
Abstract
Reversible photodegradation is a relatively new phenomenon which is not well understood. Previous research into the phenomenon has focused primarily on non-linear measurements such as amplified spontaneous emission(ASE) and two-photon fluorescence(TPF). We expand on this research by considering linear optical mea- surements, such as transmittance imaging and absorption spectroscopy, of disperse orange 11(DO11) dye-doped (poly)methyl-methacralate(PMMA) thin films and find photodegradation to contain both a reversible component and irreversible component, with the irreversible component having a small nonlinear susceptibility. From absorption measurements, and the small nonlinear susceptibility of the irreversible component, we hypothesize that the reversible component corresponds to damage to the dye, and the irreversible component is due to damage to the polymer host.
Also, we develop models of depth dependent photodegradation taking pump beam absorption and propagation into account. We find that pump absorption must be taken into account, and that ignoring the effect leads to an underestimation of the true decay rate and degree of damage. In addition, we find pump propagation effects occur on large length scales, such that they are negligible when compared to absorption and typical sample thicknesses.
Finally, we perform electric field dependent reversible photodegradation measurements and find that the underlying mechanism of reversible photodegradation is sensitive to the dye-doped polymer's electrical properties. We develop an extension to the correlated chromophore domain model to include the effect of an applied field, and find the model to fit experimental data for varying intensity, temperature, and applied electric field with only one set of model parameters.
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Details
- Title
- TESTING A GENERALIZED DOMAIN MODEL OF PHOTODEGRADATION AND SELF- HEALING USING NOVEL OPTICAL CHARACTERIZATION TECHNIQUES AND THE EFFECTS OF AN APPLIED ELECTRIC FIELD
- Creators
- Benjamin Richard Anderson
- Contributors
- Mark G Kuzyk (Advisor)Matt McCluskey (Committee Member)Philip Marston (Committee Member)Fred Gittes (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Physics and Astronomy, Department of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Number of pages
- 240
- Identifiers
- 99900581848301842
- Language
- English
- Resource Type
- Dissertation