Chin. Phys. Lett.  2006, Vol. 23 Issue (3): 629-632    DOI:
Original Articles |
Effect of Distribution Pattern of Molecular Dipoles on Microscopic Second-Harmonic Generation
DENG Xiao-Yuan;WANG Xian-Ju;LIU Han-Ping;ZHUANG Zheng-Fei;GUO Zhou-Yi
School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510631
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DENG Xiao-Yuan, WANG Xian-Ju, LIU Han-Ping et al  2006 Chin. Phys. Lett. 23 629-632
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Abstract We set up a model for dealing with the second-harmonic generation (SHG) from molecular dipoles in a line alignment pattern rather than a planar distribution under a microscope. Because of this model, it is possible to perform a flexibly quantitative investigation of SHG from collagen fibres at a molecular level. The line alignment pattern induces more significant modifications in both the angular dipole distribution structure A(θ,ψ) and the second-harmonic power structure θy (θ,ψ), compared to a planar distribution. Also, the line alignment angle t has strong effect on A(θ,ψ) and θy(θ,ψ), resulting in an irregular SHG angular power distribution. That is to say, it is unnecessary for SHG emission to present two well-defined off-axis lobes. The total SHG power shows two symmetrical peaks at angles of t=50° and t =130° while a drop at t=90°. The weakest SHG signals can be measured at t=0° and t=180°.
Keywords: 42.65.Ky      87.64.Vv      87.53.Wz     
Published: 01 March 2006
PACS:  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
  87.64.Vv  
  87.53.Wz  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2006/V23/I3/0629
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DENG Xiao-Yuan
WANG Xian-Ju
LIU Han-Ping
ZHUANG Zheng-Fei
GUO Zhou-Yi
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