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15 November 2007 Model kinetics of surface relief gratings formation in organic thin films: experimental and Monte Carlo studies
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Abstract
The semi-macroscopic mechanisms responsible for the surface relief gratings (SRG) formation on azobenzene-containing films are far from deep understanding.1 We present the results of experimental studies of SRG in PMMA and PVK polymeric matrices. The Monte Carlo (MC) kinetics of polymeric movements is reported for recently proposed model,2 which mimics the effect of mass transport along the direction of light modulation, resulting from multiple transcis photoisomerisation cycles of functionalized dyes. We show that the model, symmetric on "microscopic" level, leads to a directed mass transfer from bright to dark places. Preliminary studies show that the centers of mass of polymer chains undergo a normal diffusion under the light illumination. No global light-induced ordering of polymeric chains was detected. MC studies were performed for a system consisting of half a million of model monomers.
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G. Pawlik, W. Kordas, A. C. Mitus, B. Sahraoui, R. Czaplicki, and F. Kajzar "Model kinetics of surface relief gratings formation in organic thin films: experimental and Monte Carlo studies", Proc. SPIE 6740, Optical Materials in Defence Systems Technology IV, 674007 (15 November 2007); https://doi.org/10.1117/12.737604
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