Synthesis and nonlinear optical properties of novel fluorinated polyimides with thiazolylazo chromophores for electrooptic devices

Man He; Yuming Zhou; Jia Dai; Rong Liu; Yiping Cui; Tong Zhang

doi:10.1117/12.803386

18 November 2008 Synthesis and nonlinear optical properties of novel fluorinated polyimides with thiazolylazo chromophores for electrooptic devices

Man He, Yuming Zhou, Jia Dai, Rong Liu, Yiping Cui, Tong Zhang

Author Affiliations +

Proceedings Volume 7135, Optoelectronic Materials and Devices III; 71353V (2008) https://doi.org/10.1117/12.803386
Event: Asia-Pacific Optical Communications, 2008, Hangzhou, China

Abstract

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 (T_g) in the range of 193-200 °C with thermal stability up to 288 °C. 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 (1.8-2.1 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.

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Man He, Yuming Zhou, Jia Dai, Rong Liu, Yiping Cui, and Tong Zhang "Synthesis and nonlinear optical properties of novel fluorinated polyimides with thiazolylazo chromophores for electrooptic devices", Proc. SPIE 7135, Optoelectronic Materials and Devices III, 71353V (18 November 2008); https://doi.org/10.1117/12.803386

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