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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
Light-induced orientation in a high glass transition temperature polyimide with polar azo dyes in the side chain
Journal of the Optical Society of America B: Optical Physics, Volume 13, No. 8, Year 1996
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Description
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.
Authors & Co-Authors
Sekkat, Zouheir
Germany, Mainz
Max Planck Institute for Polymer Research
United States, Davis
University of California, Davis
Wood, Jonathan
Germany, Mainz
Max Planck Institute for Polymer Research
Knoll, Wolfgang
Germany, Mainz
Max Planck Institute for Polymer Research
Japan, Wako
Riken the Institute of Physical and Chemical Research
Germany, Munich
Administrative Headquarters of the Max Planck Society
Volksen, Willie
United States, San Jose
Ibm Research - Almaden
Miller, Robert D.
United States, San Jose
Ibm Research - Almaden
Statistics
Citations: 119
Authors: 5
Affiliations: 5
Identifiers
Doi:
10.1364/JOSAB.13.001713
ISSN:
07403224