中国物理B ›› 2010, Vol. 19 ›› Issue (11): 114208-114210.doi: 10.1088/1674-1056/19/11/114208

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Second-harmonic generation circular dichroism spectroscopy from tripod-like chiral molecular films

王晓鸥, 陈立安, 陈历学, 孙秀冬, 李俊庆, 李淳飞   

  1. Department of Physics, Harbin Institute of Technology, Harbin 150001, China
  • 收稿日期:2010-02-23 修回日期:2010-04-11 出版日期:2010-11-15 发布日期:2010-11-15
  • 基金资助:
    Project supported by the excellent Team in Harbin Institute of Technology, China, and the Natural Science Foundation of Heilongjiang Province, China (Grant No. A200406).

Second-harmonic generation circular dichroism spectroscopy from tripod-like chiral molecular films

Wang Xiao-Ou(王晓鸥)†, Chen Li-An(陈立安), Chen Li-Xue(陈历学), Sun Xiu-Dong(孙秀冬), Li Jun-Qing(李俊庆), and Li Chun-Fei(李淳飞)   

  1. Department of Physics, Harbin Institute of Technology, Harbin 150001, China
  • Received:2010-02-23 Revised:2010-04-11 Online:2010-11-15 Published:2010-11-15
  • Supported by:
    Project supported by the excellent Team in Harbin Institute of Technology, China, and the Natural Science Foundation of Heilongjiang Province, China (Grant No. A200406).

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摘要： The second-harmonic generation (SHG) circular dichroism in the light of reflection from chiral films of tripod-like chiral molecules is investigated. The expressions of the second-harmonic generation circular dichroism are derived from our presented three-coupled-oscillator model for the tripod-like chiral molecules. Spectral dependence of the circular dichroism of SHG from film surface composed of tripod-like chiral molecules is simulated numerically and analysed. Influence of chiral parameters on the second-harmonic generation circular dichroism spectrum in chiral films is studied. The result shows that the second-harmonic generation circular dichroism is a sensitive method of detecting chirality compared with the ordinary circular dichroism in linear optics. All of our work indicates that the classical molecular models are very effective to explain the second-harmonic generation circular dichroism of chiral molecular system. The classical molecular model theory can give us a clear physical picture and brings us very instructive information about the link between the molecular configuration and the nonlinear processes.

Abstract: The second-harmonic generation (SHG) circular dichroism in the light of reflection from chiral films of tripod-like chiral molecules is investigated. The expressions of the second-harmonic generation circular dichroism are derived from our presented three-coupled-oscillator model for the tripod-like chiral molecules. Spectral dependence of the circular dichroism of SHG from film surface composed of tripod-like chiral molecules is simulated numerically and analysed. Influence of chiral parameters on the second-harmonic generation circular dichroism spectrum in chiral films is studied. The result shows that the second-harmonic generation circular dichroism is a sensitive method of detecting chirality compared with the ordinary circular dichroism in linear optics. All of our work indicates that the classical molecular models are very effective to explain the second-harmonic generation circular dichroism of chiral molecular system. The classical molecular model theory can give us a clear physical picture and brings us very instructive information about the link between the molecular configuration and the nonlinear processes.

Key words: circular dichroism, three-coupled-oscillator model, tripod-like structure, second-harmonic generation circular dichroism

中图分类号:  (Frequency conversion; harmonic generation, including higher-order harmonic generation)

  • 42.65.Ky
78.20.Fm (Birefringence) 78.66.-w (Optical properties of specific thin films)