Synthesis and nonlinear optical properties of novel fluorinated polyimides with thiazolylazo chromophores for electrooptic devices
A series of novel fluorinated polyimides second-order nonlinear optical (NLO) materials were synthesized from poly(hydroxy-imide)s, followed by the Mitsunobu reaction with NLO thiazolylazo chromophores. The polyimides prepared were characterized by IR, UV-vis, gel permeation chromatography (GPC), thermogravimetric analysis (TGA), differential scanning calorimetric analysis (DSC) and X-ray diffraction (XRD). These NLO polyimides possess high glass transition temperature (Tg) in the range of 180-210 with thermal stability up to 288 . The electro-optic coefficients (r33) at the wavelength of 1550nm for polymer thin films poled were measured by the attenuated total reflection (ATR) method. The r33 values of the polyimides 1a and 2a containing thiazolylazoaniline chromophore are better than that of the polyimides 1b and 2b attached thiazolylazopyrimidine chromophore, due to the thiazolylazoaniline chromophore having large hyperpolarizability in contrast to the thiazolylazopyrimidine chromophore. Low optical losses (1.0-1.4 dB/cm at 1.55 μm), which were measured via an immersion technique have been observed for these polymers. The polyimides demonstrate an excellent combination of thermal stability, electrooptic (EO) coefficients and optical loss, and therefore they are suitable for EO applications.
polyimide NLO electrooptic coefficient chromophore thermal stability optical loss
Man He Yuming Zhou Jia Dai Rong Liu Yiping Cui Tong Zhang
School of Chemistry and Chemical Engineering,Southeast University,Nanjing 211189,China Department of Electronic Engineering,Southeast University,Nanjing 210096,China
国际会议
2008亚太光通信会议(Asia-Pacific Optical Communications 2008)
杭州
英文
2008-10-26（万方平台首次上网日期，不代表论文的发表时间）