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http://dx.doi.org/10.3807/KJOP.2002.13.4.356

Second harmonic generation of pulsed corona - poled nonlinear optical polymer films  

Kim, Jun-Soo (Department of Molecular Science and Technology)
Lee, Jong-Ha (Department of Molecular Science and Technology)
Lee, Hwang-Un (Department of Molecular Science and Technology)
Kim, Sang-Youl (Department of Molecular Science and Technology)
Won, Young-Hee (Deparment of Physics Ajou University)
Publication Information
Korean Journal of Optics and Photonics / v.13, no.4, 2002 , pp. 356-362 More about this Journal
Abstract
The molecular orientational dynamics of the nonlinear optical(NLO) side-chain polymer N-(4-nitrophenyl)-(L)-prolinol-poly (pphenylene terephthalates) have been studied using nonlinear optical responses as measured by second harmonic generation (SHG). A new pulsed corona poling is used to orient the NLO chromophores and the polymer segments into the noncentrosymmetric structure required to obtain the SHG signal. By corona poling of negative high voltage pulses with variable repetition rates (between 0.5 and 10 ㎑) at temperature between 25$^{\circ}C$ and 80$^{\circ}C$, well below and about the glass transition temperature 70$^{\circ}C$, the side-chain chromophores and the polymer chain contour rearrange themselves and create the domain structure observed by atomic force microscopy(AFM). The pulsed corona voltage enhances the orientational ordering of the NLO chromophores and also significantly influences the growth of SHG signal and the improved relaxation behavior after the poling field is removed, reducing the visible damage to the polymer film dramatically. This new pulsed corona poling experiment gave direct in situ evidence that the NLO chromophore and the polymer backbone undergo anisotropic rearrangement during the poling process.
Keywords
pulsed corona poling; second harmonic generation; nonlinear optical side-chain polymer film;
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