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

作　　者：王晓鸥 陈立安 陈历学 孙秀冬 李俊庆 李淳飞 

机构地区：[1]Department of Physics,Harbin Institute of Technology

出　　处：《Chinese Physics B》2010年第11期427-435,共9页中国物理B（英文版）

基　　金：Project supported by the excellent Team in Harbin Institute of Technology,China;the Natural Science Foundation of Heilongjiang Province,China (Grant No. A200406)

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 ehiral 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.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 ehiral 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.

关 键 词：circular dichroism three-coupled-oscillator model tripod-like structure second- harmonic generation circular dichroism 

分 类 号：O484.41[理学—固体物理] O627.23[理学—物理]