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Journal of Biomedical Optics

Theoretical simulation study of linearly polarized light on microscopic second-harmonic generation in collagen type I
Author(s): Ying Chang; Changshui Chen; Jianxin Chen; Ying Jin; Xiao-Yuan Deng
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Paper Abstract

A theoretical model is established for dealing with second-harmonic generation (SHG) in type I collagen excited by linearly polarized light focused by a microscope. With this model, the effects of the polarization angle α, numerical aperture (NA), as well as the ratio of hyperpolarizability ρ=β xxx/β xyy on SHG emission have been investigated. Simulation results reveal that SHG emission power changes periodically as α. The use of lower NA leads to weaker SHG emission but is more concentrated in two closer lobes, whereas more distributed emission in two detached lobes appear at higher NA. As the introduction of polarization direction, which is not along with the fiber axis (alpha ≠ 0 deg), one more element β xyy is valid in our case than β xxx alone, while their ratio ρ plays a very important role for collagen features characterization. SHG emission with ρ shows complicated modality that SHG emission is different at different α and not symmetric at ± ρ except at α=0 deg, suggesting the important impact of polarization working on ρ for SHG emission. Our theoretical simulation results provide useful clues for experimental study of microscopic SHG emission in collagen excited by linearly polarized beam.

Paper Details

Date Published: 1 July 2009
PDF: 12 pages
J. Biomed. Opt. 14(4) 044016 doi: 10.1117/1.3174427
Published in: Journal of Biomedical Optics Volume 14, Issue 4
Show Author Affiliations
Ying Chang, South China Normal Univ. (China)
Changshui Chen, South China Normal Univ. (China)
Jianxin Chen, Fujian Normal Univ. (China)
Ying Jin, South China Normal Univ. (China)
Xiao-Yuan Deng, South China Normal Univ. (China)


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