Sol-Gel Process of Nonlinear Optical Silica Films with Organic chromophore as Side Chain

• Main Authors: Wu, Shao-Ling, 吳小玲
• Other Authors: Sung, Po-Hou
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/75035048789388446419

碩士 === 輔仁大學 === 化學學系 === 82 === The incorporation of organic chromophore into glassy polymer matrix and alignment in a high dc electric field is a newly developed technique to obtain a nonlinear optical polymeric material . However , due to the rotational freedom of the chromophore and relaxation of the main chain , the second order nonlinear optical properties are usually not very stable while the temperature approaches the glass transition temperature of the matrix . In this study , we are trying to exploit the method of sol-gel process to synthesize organic chromophore modified silicate film . Due to the high glass transition temperature of SiO2 (Tg > 1000oC) , we are able to produce a thermally stable nonlinear optical silicate film with high second harmonic response , d33=46 mp/V . HCl is a commonly used catalyst in the sol-gel process. However, our experiment showed that adding of ionic species may interact with electric field. The thermal stability of the second harmonic with time has also been obseverd with and without HCl at 60oC. The film without HCL is very stable and shows no signal decay while the film which contains HCL shows substantial decay with time .