Nonlinear optical side‐chain polymers post‐functionalized with high‐β chromophores exhibiting large electro‐optic property |
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Authors: | Xianqing Piao Xianmin Zhang Yuichi Mori Masayuki Koishi Akinari Nakaya Shinichiro Inoue Isao Aoki Akira Otomo Shiyoshi Yokoyama |
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Affiliation: | 1. Institute for Materials Chemistry and Engineering, Kyushu University, 6‐1 Kasuga 815‐8580, Japan;2. Department of Physics, Liaoning University, 66 Chongshan Middle Road, Shenyang 110036, China;3. National Institute for Information and Communications Technology, 588‐2 Iwaoka, Nishi‐ku, Kobe 651‐2492, Japan |
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Abstract: | Electro‐optic side‐chain polymers have been synthesized by the post‐functionalization of methacrylate isocyanate polymers with novel phenyl vinylene thiophene vinylene bridge (FTC) nonlinear optical chromophores. For this application, FTC‐based chromophores were modified in their electronic donor structure, exhibiting much larger molecular hyperpolarizabilities compared with the benchmark FTC. Of these new chromophores, absorption spectra, hyper‐Rayleigh scattering experiment, and thermal analysis were carried out to confirm availability as effective nonlinear optical units for electro‐optic side‐chain polymers. The electro‐optic coefficients (r33) of obtained polymers were investigated in the process of in situ poling by monitoring the temperature, current flow, poling field, and electro‐optic signal. Compared with the nonsubstituted analogue, benxyloxy modified FTC chromophore significantly achieved higher nonlinear optical property, exhibiting molecular hyperpolarizability at 1.9 μm of 4600 × 10?30 esu and an r33 value of 150 pm/V at the wavelength of 1.31 μm. Synthesized electro‐optic polymers showed high glass transition temperature (Tg), so that the temporal stability examination exhibited >78% of the electro‐optic intensity remaining at 85 °C over 500 h. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010 |
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Keywords: | electro‐optic coefficient electro‐optic polymer functionalization of polymer molecular hyperpolarizability NLO poling side‐chain polymer thermal properties |
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