Establishment of the Axial Order

The decrease of the optical absorption spectrum is due to the incident light polarization in the film plane, whereas molecules orient, under poling, in the direction perpendicular to the thin film surface. From this variation one can determine the order parameter 2 using the following equation  

The build up of the order parameter with poling time t may be well described by a monoexponential function [152, 153]  

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