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A low glass transition temperature photorefractive polymer systems

Author: LuoLin
Tutor: JiaYouJian
School: Kunming University of Science and Technology
Course: Optics
Keywords: Glass transition temperature Photoconductive Photorefractive effect Refractive index modulation Difference
CLC: TN204
Type: Master's thesis
Year: 2010
Downloads: 26
Quote: 0
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Abstract


The organic material is an important branch of the photoelectric material, due to its applicability in many areas, carried out in-depth research of organic materials. The core task of this field of research is constantly developing new materials to obtain better characteristics, such as high-efficiency, high-sensitivity, high-speed, long life and low price. In this area, the non-linear optical materials with prospects. Using a nonlinear optical material, and can control the optical signal. Under appropriate conditions, some of the parameters of the signal, such as frequency, phase, and the transfer direction, so can be changed. Photorefractive materials is a very important non-linear optical materials, and it is one of the most promising materials for the production of optoelectronic and optical devices. Photorefractive material is a special photoconductor space electric field can be generated within the material in the non-uniform illumination, with the nonlinear optical properties of the material or spontaneous / field induced birefringence, the electric field in turn modulation of refraction of the material rate. The photorefractive effect related applications, such as data storage, holographic and image processing. Photorefractive material is divided into two major categories of inorganic crystals and organic materials. Compared to inorganic crystals, organic material has a low price, short production time, light weight and easy to handle, and thus is gradually replacing inorganic crystals. In the organic material, the advantages of photorefractive polymer is more prominent. The purpose of this study is formulated with a low glass transition temperature (Tg) of the photorefractive polymer systems. We choose a glass transition temperature of 200 ° C, polyvinyl carbazole (PVK) as a matrix, and using plasticizer 9 - ethylcarbazole (ECZ) to reduce the polymer's glass transition temperature, followed by use of differential scanning calorimetry the calorimeter measurement sample glass transition temperature of 20 ° C, thereby successfully reducing the glass transition temperature of the polymer system. Inorganic nanocrystals gadolinium oxide (Gd2O3), and then incorporated in the polymer under the electric field orientation drive around the orientation of the polymer molecules, thereby enhancing its photorefractive properties. After configured polymeric system, the determination of the polymer system has a good photoconductivity. Its photorefractive characteristics has been verified by two-beam coupling experiments and grating moving. When the direction of the electric field in the two-beam coupling experiments occurred flip the direction of energy transfer between the two beams will rollover occurs. 632.8 nm laser irradiation, the optical photorefractive response time of more than 1000 seconds, by the 533 nm laser wavelength selection of higher absorption coefficient of the material of the photorefractive response speed is greatly improved, its response time to 8 seconds or so. Finally, through instantaneous ellipsometry, we determined alignment enhancement effect is the refractive index modulation is the only mechanism in the polymer system.

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