物理化学学报 >> 2011, Vol. 27 >> Issue (08): 1985-1989.doi: 10.3866/PKU.WHXB20110818

光化学和辐射化学 上一篇    下一篇

中心对称双酞菁铥LB膜二次谐波产生特性

刘云龙1, 王文军1, 高学喜1, 徐建华2   

  1. 1. 聊城大学物理科学与信息工程学院, 山东 聊城 252059;
    2. 华东师范大学物理系, 精密光谱科学与技术国家重点实验室, 上海 200062
  • 收稿日期:2011-04-06 修回日期:2011-05-31 发布日期:2011-07-19
  • 通讯作者: 王文军 E-mail:phywwang@163.com
  • 基金资助:

    国家自然科学基金(10874063), 山东省科技攻关项目(2010GGX10127)和山东省高等学校科技计划项目(J10LA60)资助

Second Harmonic Generation Properties of Centrosymmetric Bisphthalocyaninato Thulium in Langmuir-Blodgett Films

LIU Yun-Long1, WANG Wen-Jun1, GAO Xue-Xi1, XU Jian-Hua2   

  1. 1. School of Physical Science & Information Technology, Liaocheng University, Liaocheng 252059, Shandong Province, P. R. China;
    2. State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, P. R. China
  • Received:2011-04-06 Revised:2011-05-31 Published:2011-07-19
  • Contact: WANG Wen-Jun E-mail:phywwang@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (10874063), Key Project of Science and Technology of Shandong Province, China (2010GGX10127) and Shandong Province Higher Educational Science and Technology Program, China (J10LA60).

摘要:

利用二次谐波产生(SHG)方法研究了中心对称分子稀土夹心双酞菁铥(TmPc2) Langmuir-Blodgett (LB)膜二阶非线性光学特性, 测量了二次谐波强度随入射基频光入射角的关系, 并对其二阶非线性产生机制进行了讨论. 实验结果表明, TmPc2分子LB膜具有较好的二次谐波信号, 二次谐波信号强度的最大值在基频光入射角为45°的地方, 其二阶非线性极化率χ(2)和分子超极化率β分别为1.152×10-8和1.905×10-30 esu. 通过测量样品二次谐波信号的偏振特性, 并与理论分析相比较, 得出其二阶非线性起源于电四极子作用机制.

关键词: 酞菁铥, LB膜, 非线性光学, 二次谐波产生, 电四极子机制

Abstract:

The second order nonlinear optical properties of sandwich thulium bisphthalocyanine (TmPc2) molecule Langmuir-Blodgett (LB) films were investigated using the second harmonic generation (SHG)method. The dependence of the second harmonic intensity on the incident angle of the fundamental beam was measured and the mechanisms of nonlinearity were discussed briefly. The experimental results indicated that the second harmonic signal intensity was very strong and its maximum was obtained at an incident angle of 45°. The second order nonlinear optical susceptibility χ(2) was about 1.152×10-8 esu and the hyperpolarizability β was about 1.905×10-30 esu. By measuring the polarization properties of the second harmonic signal for the LB film and comparing this with the theoretical analysis, we found that the origin of the second harmonic generation was attributed to the electric quadrupole mechanism for the TmPc2 molecule.

Key words: Terbium bisphthalocyanine, Langmuir-Blodgett film, Nonlinear optics, Second harmonic generation, Electric quadrupole mechanism

MSC2000: 

  • O644