Anisotropic Self-Alignment of Supramolecular Amylose Inclusion of Chromophores for Second-Order Nonlinear Optical Materials
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Kim, Oh-Kil, Ling-Siu Choi, He-Yi Zang, Xue-Hua He, and Yan-Hua Shih. “Anisotropic Self-Alignment of Supramolecular Amylose Inclusion of Chromophores for Second-Order Nonlinear Optical Materials.” Organic Thin Films for Photonic Applications (1995), Paper MD.31, Optica Publishing Group, September 11, 1995, MD.31. https://doi.org/10.1364/OTFA.1995.MD.31.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
Anisotropic alignment of nonlinear chromophores and their dipolar stability are the key issues¹ of nonlinear optical (NLO) materials. Poling is a usual means in guest-host systems to bring about such an alignment²-⁴. Since poling is carried out around the glass transition temperature(Tg) of hosts⁵, and the temporal stability of chromophores depends primarily on Tg values of hosts, matrix materials for high-temperature stability are required to have high Tg such as with polyimides. However, the high-temperature poling causes problems in nonlinear chromophores, such as bleaching⁶-⁷, decomposition⁸,⁹ or loss of dipolar alignment¹⁰, unless they have very high decomposition temperatures. Also, a related problelm is a plasticizing effect⁸,¹¹ of chromophores which lowers the Tg of the matrix with increasing chromophore concentration.