Relaxation studies of thin films oriented by corona poling for a poly(p-phenyleneterephthalate) with nonlinear optical side groups
- 5 April 1999
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 74 (14) , 2067-2069
- https://doi.org/10.1063/1.123759
Abstract
We report relaxation studies of corona-poled aromatic polyester bearing a nonlinear optical (NLO) chromophore as a side group. The effects of film thickness on the temporal stability of the NLO coefficient and atomic force microscope observation of corona-poling-induced film surface roughening are presented. The results indicated that this material exhibits exceptionally good temporal stability of the second-harmonic generation coefficient at room temperature even though its glass transition temperature, Tg is quite low. The temporal stability of the chromophore orientation seems to result from the coupling between the chromophore and its anisotropic surface domain environment. Thus, the design strategies to lock the domain itself would be valuable for improving geometrically long-term stability of second-order NLO properties.Keywords
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