| Original Articles |
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Anisotropy in Third-Order Nonlinear Optical Susceptibility of a Squarylium Dye in a Nematic Liquid Crystal |
| JIN Zhao-Hui;LI Zhong-Yu;KASATANI Kazuo;OKAMOTO Hiroaki |
| Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai Ube 755-8611, Japan |
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| Cite this article: |
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JIN Zhao-Hui, LI Zhong-Yu, KASATANI Kazuo et al 2006 Chin. Phys. Lett. 23 635-638 |
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Abstract A squarylium dye is dissolved in 4-cyano-4’-pentylbiphenyl (5CB) 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 X3e 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 X3e, 10.8±1.2, is observed for the oriented layers.
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| Keywords:
42.70.Nq
42.65.An
78.20.Wc
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Published: 01 March 2006
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| PACS: |
42.70.Nq
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(Other nonlinear optical materials; photorefractive and semiconductor materials)
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42.65.An
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(Optical susceptibility, hyperpolarizability)
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78.20.Wc
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