Mr. Weixiang Gong Profile

Weixiang Gong

at soochow university

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Proceedings Article | 19 October 2016 Paper

Investigation on ultrafast third-order nonlinear optical properties of benzothiadiazole copolymer with triphenylamine derivative side chain

Weixiang Gong, Junyi Yang, Yuan-cheng Qin, Xing-zhi Wu, Xiao Jin, Yinglin Song

Proceedings Volume 10152, 101520L (2016) https://doi.org/10.1117/12.2246172

KEYWORDS: Ultrafast phenomena, Polymers, Nonlinear optics, Optical properties, Photons

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The third-order nonlinear optical properties of benzothiadiazole copolymer with triphenylamine derivative side chain (BCT) dissolved in chloroform are investigated by top-hat Z-scan and time-resolved pump-probe techniques with a picoseconds pulses laser at wavelength of 532nm. Organic polymers of triphenylamine have been widely applied to optoelectronic devices owing to its outstanding physics and chemistry characteristic. So its nonlinear optical characteristic is worth studying. The sample's excited-state dynamics can be detected by the pump-probe with phase object device with/without an aperture in the far field. We can determine the sample's nonlinear absorptive and refractive coefficient by the top-hot Z-scan device with/without an aperture in the far field. The experimental results show that the BCT has a good reverse saturation absorption and negative refraction. At the same time, the BCT showed up long excited-state lifetimes. By means of a five-level model and analyzing the experimental curves, all nonlinear optical parameters are obtained. With the proper lifetime and intersystem crossing time, this sample can be a candidate for optical limiting.

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