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Anisotropy in Third-Order Nonlinear Optical Susceptibility of a Squarylium Dye in a Nematic Liquid Crystal
作者姓名:金朝辉  李忠正  KASATANI  Kazuo  OKAMOTO  Hiroaki
作者单位:Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai Ube 755-8611, Japan
摘    要:A squarylium dye is dissolved in 4-cyano-4'-pentylbiphenyl (SCB) and oriented by sandwiching mixtures between two pieces of rubbed glass plates. The optical absorption spectra of the oriented squarylium dye-5CB layers exhibit high anisotropy. The third-order nonlinear optical responses and susceptibilities X^(3)e of squarylium dye in 5CB are measured with light polarizations parallel and perpendicular to the orientational direction by the resonant femtosecond degenerate four-wave mixing (DFWM) technique. Temporal profiles of the DFWM signal of the oriented squarylium dye-5CB layers with light polarizations parallel and perpendicular to the orientational direction are measured with a time resolution of 0.3ps (FWHM), and are found to consist of two components, i.e., the coherent instantaneous nonlinear response and slow response due to the formation of excited molecules. A high anisotropic ratio of x^(3)e, 10.8 :k 1.2, is observed for the oriented layers.

关 键 词:各向异性  第三次序非线性光敏感度  向列液晶  SCB  非线性光学响应
收稿时间:2005-10-18
修稿时间:2005-10-18

Anisotropy in Third-Order Nonlinear Optical Susceptibility of a Squarylium Dye in a Nematic Liquid Crystal
JIN Zhao-Hui, LI Zhong-Yu.Anisotropy in Third-Order Nonlinear Optical Susceptibility of a Squarylium Dye in a Nematic Liquid Crystal[J].Chinese Physics Letters,2006,23(3):635-638.
Authors:JIN Zhao-Hui  LI Zhong-Yu
Abstract:
Keywords:
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