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Phys. Rev. E 72, 036601 (2005) [10 pages]

Analysis of surface second-harmonic generation by orientational distribution function in a chiral polymer film

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N. Y. Ha1, S. H. Han2, D. W. Jeon3, C.-S. Jung4, Byoungchoo Park5, Hideo Takezoe6, and J. W. Wu1,*
1Department of Physics, Ewha Womans University, Seoul 120-750, Korea
2Advanced Photonics Research Institute, GIST, Gwangju 500-712, Korea
3Department of Clothing & Textiles, Ewha Womans University, Seoul 120-750, Korea
4Department of Optical Engineering, Chongju University, Chongju 360-764, Korea
5Department of Electrophysics, Kwangwoon University, Seoul 139-701, Korea
6Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan

Received 9 December 2004; published 7 September 2005

By adopting classical models of molecular chirality, contributions of the coupled-oscillator and helix natures to the chiral surface second-order susceptibilities are identified through introduction of a molecular orientational distribution. Experimentally, surface orientational distribution functions at interfaces of an isotropic chiral chitosan polymer film are determined from second harmonic generation measurement. The largest chiral component of surface nonlinear optical susceptibility is from the electric-magnetic coupling with dominant contribution from the helix nature of chitosan.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevE.72.036601
DOI:
10.1103/PhysRevE.72.036601
PACS:
42.70.Jk, 33.55.Ad, 68.47.Mn, 42.65.Ky

*Electronic address: jwwu@ewha.ac.kr

 
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