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TitleThe effect of bulky groups on the electro-optic coefficient r33 of a pyridine-donor nonlinear optical chromophore
Publication TypeJournal Article
Year of Publication2016
AuthorsQuilty, J.W., Thomas D.G., Clarke D.J., and Breukers R.D.
JournalOptical Materials
Pagination147 - 154
Date Published2016
ISSN09253467 (ISSN)
KeywordsChromophores, Electrooptic effects, Electrooptical devices, Ellipsometry, Host-guest polymers, Integrated optics, merocyanine, Modulation, Molecular aggregation, Polymers, Pyridine, Pyridinylidene
AbstractThe effect of bulky groups attached to pyridine-donor chromophores on the electro-optic coefficient r33 of host-guest polymers was measured by modulation ellipsometry. Overall, the experimental results indicated no significant beneficial effect of the bulky groups on r33. The maximum r33 achieved was just under 6 pm/V for the plain chromophore, compared with the expected 20 pm/V based on the molecular properties. Decomposition of the chromophore absorption band revealed significant aggregation, with the monomer fraction estimated to be marginally less than 1/3 for all chromophores studied. We attribute the lower achieved r33 values to increased molecular aggregation. © 2016 Elsevier B.V. All rights reserved.

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