Diffraction Measurement for Grating Formed in Optically Poled Polymeric Materials
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概要
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Recent development of all optical poling technique enables the creation of the photo-induced noncentrosymmetric polarization in the polymeric matrix. In this new method, third-order optical nonlinearity of coherent superposition between fundamental and second harmonic waves is significantly responsible for the creation of polar field which induces the noncentrosymmetric polarization ($\chi^{(2)}$ polar structure) in the polymeric matrix. In this study, we employed a diffraction technique to investigate the gratings formed in optically poled polymeric materials. Increase of the diffraction intensity follows the increase (growth) of the second harmonic wave induced by the $\chi^{(2)}$ polar structure. Diffraction efficiency increases with increasing film thickness up to 4.5 $\mu$m. The origin of the diffraction is ascribed to the higher-order of diffraction, i.e. the unsymmetrical grating formed at double spatial frequency between unpoled and poled fringes. These results gave direct evidence of existence of the periodic $\chi^{(2)}$ polar structure in optically poled polymeric materials.
- Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
- 2001-04-15
著者
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Yamamoto Jun
Department Of Anesthesiology Sapporo Medical University School Of Medicine
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Sakai Wataru
Department Of Macromolecular Science And Engineering Kyoto Institute Of Technology
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Tsutsumi Naoto
Department Of Macromolecular Science And Engineering Kyoto Institute Of Technology
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Sakai Wataru
Department of Polymer Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo, Kyoto 606-8585, Japan
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Tsutsumi Naoto
Department of Chemistry, Faculty of Science, Kyushu University 33
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