Journal
SYNTHETIC METALS
Volume 115, Issue 1-3, Pages 121-125Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0379-6779(00)00332-5
Keywords
azo-dye polymers; holography; photoinduced gratings; molecular movements
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Direct and reversible holographic recording of surface-relief gratings in ate-dye polymers was recently evidenced using atomic force microscopy. Irradiation with an interference pattern of polarized laser beams was observed to lead to substantial mass-transport. In typical experiments, the wavelength of the laser was chosen to he near the absorption of the chromophores. The surface gratings have a negative amplitude which can be as large as twice the polymer film thickness. The origin of such photo-driven mass transport is still unclear. We provide here experimental evidence of a migration of the chromophores from high to low intensity regions. It indicates that, in such doped or grafted guest-host systems, polymer chain migration is a result of the guest chromophores photoinduced movements. This is in good agreement with our recently developed model of ate-dye photoinduced translation diffusion. (C) 2000 Elsevier Science S.A. All rights reserved.
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