Nonlinear Optical and Charge Distribution Studies Probing Electric Field Effects in Polymer Thin Films for Second Order Nonlinear Optical Applications.
Final rept. 1 May 93-30 Apr 96,
PURDUE UNIV LAFAYETTE IN SCHOOL OF CHEMICAL ENGINEERING
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The goals of the research are two fold First, determine the internal electric field effects from studies of charge magnitude, symmetry and distribution in dye-doped polymer systems. Second, a better understanding of the electric field effects on the chromophore mobility during and after poling. To this end, several techniques are being employed. Electrochromism technique is being used to determine the charge magnitude inside film samples. The films are 4-dimethylamino-4-nitrostilbene and disperse red 1 chromophores doped into polyMethyl methacrylate guest-host systems. Charge symmetry is also being studies using thermal pulse experiments. Preliminary result show that the charges are distributed linearly in the sample. More tests will be performed in search of any local charge distribution inhomogeneities. An interferometric technique with in-situ poling was used to probe the poling field- induced molecular alignment of the chromophores as a function of temperature. Results are showing the dependence of poling on electric fields magnitude and polarity. Integrated systems will further reveal the loses in the films due to the field Dependent chromophore orientation.
- Physical Chemistry
- Electricity and Magnetism