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

• Published in: Chinese physics B Vol. 19; no. 11; pp. 427 - 435
• Main Author: 王晓鸥 陈立安 陈历学 孙秀冬 李俊庆 李淳飞
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.11.2010
• Subjects: 三脚架; 二次谐波产生; 分子手性; 分子膜; 圆二色光谱; 圆二色性; 薄膜参数; 非线性过程
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/11/114208

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.