| 直流电场诱导LB膜中分子重新取向研究 |
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| 引用本文： | 韩奎,吴玉喜,张学龙,张国营,陆兴泽,王文澄.直流电场诱导LB膜中分子重新取向研究[J].光子学报,2001,30(6):699-703. |
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| 作者姓名： | 韩奎 吴玉喜 张学龙 张国营 陆兴泽 王文澄 |
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| 作者单位： | 1. 中国矿业大学理学院物理科学与技术系，江苏徐州 221008
2. 复旦大学物理系，三束材料改性国家重点实验室与激光物理研究室，上海 200433 |
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| 摘 要： | 用旋转二次谐波产生方法研究了半花菁/花生酸Y型交替LB多层膜中由外加法向直流电场诱导的分子的重新取向.外加法向直流电场能够有效地改变LB膜中光学活性半花菁分子的取向,迫使其长轴转向电场的方向.随着极化电场的增大,分子在基板平面内的各向异性逐渐减小,而二次谐波强度的增量则随外加电场的增大而呈现平方增长的规律.在室温下,用1.3×106V/m的电场极化10min,可以使半花菁LB多层膜的二次谐波强度增大一个量级.
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| 关 键 词： | Langmuir-Blodgett多层膜 二次谐波产生 电场极化 半花菁 |
| 收稿时间： | 2000-11-26 |
| 修稿时间： | 2000年11月16 |
THE MOLECULAR REORIENTATION IN LB FILMS INDUCED BY DC ELECTRIC FIELD |
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| Han Kui,Wu Yuxi,Zhang Xuelong,Zhang Guoying.THE MOLECULAR REORIENTATION IN LB FILMS INDUCED BY DC ELECTRIC FIELD[J].Acta Photonica Sinica,2001,30(6):699-703. |
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| Authors: | Han Kui Wu Yuxi Zhang Xuelong Zhang Guoying |
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| Institution: | Han Kui,Wu Yuxi,Zhang Xuelong,Zhang Guoying Department of Physics,Science and Technology,Science College,China University of Mining & Technology,Xuzhou Jiangsu 221008,China Lu Xingze,Wang Wencheng State Key Joint Laboratory for Modification by Laser |
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| Abstract: | Rotation angle second harmonic generation technique was used to investigate change of molecular orientation in Y type interleaving hemicyanine/arachidic acid LB multilayers poled by an electric field An external DC field along the surface normal forced the molecular chromophore axes to reorient towards the poling field direction,leading to a reduction of the dipping induced in plane anisotropy and enhancement of the macroscopic optical nonlinearity upon poling With increasing the poling field,the SHG intensity of the poled LB films increased quadratically due to molecular reorientation towards the substrate normal,and reach an order of magnitude with a field of 10 6V/m and poling time 10min at room temperature |
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| Keywords: | Langmuir Blodgett multilayers Second harmonic generation Electric field poling Hemicyanine |
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