Generic stochastic Monte Carlo model of the photoinduced mass transport in azo-polymers and fine structure of Surface Relief Gratings
1 Institute of Physics, Wroclaw University of Technology - Wroclaw, Poland
2 Institute of Physical and Theoretical Chemistry, Wroclaw University of Technology - Wroclaw, Poland
Received: 4 October 2013
Accepted: 10 January 2014
We study theoretically the possible origin of a double-peak fine structure of Surface Relief Gratings in azo-functionalized poly(etherimide) reported recently in experiments. To improve the statistics of experimental data additional measurements were done. For the theoretical analysis we develop a stochastic Monte Carlo model for photoinduced mass transport in azobenzene-functionalized polymer matrix. The long sought-after transport of polymer chains from bright to dark places of the illumination pattern is demonstrated and characterized, various scenarios for the intertwined processes of build-up of density and SRG gratings are examined. Model predicts that for some azo-functionalized materials double-peak SRG maxima can develop in the permanent, quasi-permanent or transient regimes. Available experimental data are interpreted in terms of model's predictions.
PACS: 68.55.am – Polymers and organics / 82.30.Qt – Isomerization and rearrangement / 82.50.Hp – Processes caused by visible and UV light
© EPLA, 2014