Model kinetics of surface relief gratings formation in organic thin films: experimental and Monte Carlo studies

G. Pawlik; W. Kordas; A. C. Mitus; B. Sahraoui; R. Czaplicki; F. Kajzar

doi:10.1117/12.737604

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15 November 2007 Model kinetics of surface relief gratings formation in organic thin films: experimental and Monte Carlo studies

G. Pawlik, W. Kordas, A. C. Mitus, B. Sahraoui, R. Czaplicki, F. Kajzar

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Proceedings Volume 6740, Optical Materials in Defence Systems Technology IV; 674007 (2007) https://doi.org/10.1117/12.737604
Event: Optics/Photonics in Security and Defence, 2007, Florence, Italy

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 trans ↔ cis 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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