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13 September 2007 A new mechanism of relaxation in poled guest-host systems: Monte Carlo analysis of aggregation scenario
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Abstract
The mechanisms responsible for a strongly nonlinear dependence on concentration of electro-optic coefficient in poled thin films of a guest - host system, consisting of charge transfer chromophores in a polymer matrix, are in the center of interest since last decade. This effect is probably due to an aggregation of chromophores (dipoles), leading to a cancellation of second-order nonlinear optical susceptibilities. Recently, a direct observation of a process of aggregation of dipoles was reported by Rau et al. An important role for the relaxation is played by an accelerated chromophore aggregation due to heating. We analyze the Monte Carlo kinetics of a poled guest-host system using simulation methods developed for studies of diffraction gratings formation and erasure. Preliminary results indicate a presence in the system of quasi one-dimensional (1D) object - spatial curves - along which the dipoles are aligned. Some of the lines form closed loops, leading to a decrease of nonlinear optical properties. Monte Carlo kinetics of simple processes related to poling of host-guest and purely dipolar systems is presented and discussed.
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Grzegorz Pawlik, Dominik Wronski, Antoni C. Mitus, Ileana Rau, Chantal Andraud, and Francois Kajzar "A new mechanism of relaxation in poled guest-host systems: Monte Carlo analysis of aggregation scenario", Proc. SPIE 6653, Linear and Nonlinear Optics of Organic Materials VII, 66530J (13 September 2007); https://doi.org/10.1117/12.737399
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