Preparation And Nonlinear Optical Performance Of MDA Hybrid Film

Recently, second-order nonlinear optical (NLO) polymer materials have been widely studied for great usages, profiting in waveguide electrooptic modulation and frequency-doubling devices, especially organic-inorganic second-order NLO hybrid materials having good qualities of organic materials and inorganic materials are emphasis introduced.In this paper, the new chromosphore molecule DO3-AGE had synthesized, and then a new precursor alkoxysilane dye (ASD) was synthesized by radical polymerization. Finally, a new organic-inorganic second-order NLO hybrid material MDA was synthesized by sol-gel process and the radical polymerization. The structure of DO3-AGE, ASD and MDA were characterized by FTIR,MS, UV-V, etc. Three radical polymerizations were analyzed and main-chain-embedded NLO hybrid material MDA was predicted. The influences of temperature and hardener BPO on the reaction were studied. The optimal conditions of the radical polymerization were determined.As results, MDA has good thermo-properties and optical-properties tested by TG,DSC,UV-Vis,AFM,SHG testing, etc. MDA has a high Tg, the temperature corresponding to the weight loss of 5% has reached above 300℃; The content of chromosphore molecules have reached 23×1020molecule/cm3; the order parameter of the film is 0.41; numerous small grains could be observed spreading on the entire surface area with a minor surface roughness of 1~2.77nm; the second-order nonlinear optical coefficient has been above 10-7 magnitude; the SHG curve of MDA film shows that the resulting main-chain-embedded film has higher NLO susceptibility. All these results implied that the main-chain-embedded hybrid networks could reduce effectively the dipole alignment relaxation of the chromophores, and thus lead to better orientation stability.