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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 13, Iss. 8 — Aug. 1, 1996
  • pp: 1713–1724

Light-induced orientation in a high glass transition temperature polyimide with polar azo dyes in the side chain

Zouheir Sekkat, Jonathan Wood, Emil F. Aust, Wolfgang Knoll, Willi Volksen, and Robert D. Miller  »View Author Affiliations


JOSA B, Vol. 13, Issue 8, pp. 1713-1724 (1996)
http://dx.doi.org/10.1364/JOSAB.13.001713


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Abstract

We report on both polar and nonpolar light-induced orientation of a polyimide of high glass transition temperature (Tg≈210 °C) with nonlinear optical azo dye molecules in the side chain. This photoinduced orientation is shown to occur at room temperature, i.e., at least 190 °C below the Tg value of the polymer, which indicates that the photoisomerization-induced movement of the nonlinear optical chromophores induces, in turn, a movement of the polyimide main chain. This allows for an efficient orientation of the dye molecules in spite of the stiffness of the polyimide main chain. A nonpolar orientation is induced by polarized light irradiation alone, whereas polar orientation is achieved by application of a dc field during the photoisomerization process. Further light irradiation in the absence of a dc field destroys the previously induced stable polar order. A detailed theoretical study of this light-induced depoling process is also presented.

© 1996 Optical Society of America

Citation
Zouheir Sekkat, Jonathan Wood, Emil F. Aust, Wolfgang Knoll, Willi Volksen, and Robert D. Miller, "Light-induced orientation in a high glass transition temperature polyimide with polar azo dyes in the side chain," J. Opt. Soc. Am. B 13, 1713-1724 (1996)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-13-8-1713


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References

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