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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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| Cite this article: |
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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°.
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42.65.Ky
87.64.Vv
87.53.Wz
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Published: 01 March 2006
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| PACS: |
42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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87.64.Vv
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87.53.Wz
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