期刊
OPTICAL MATERIALS
卷 31, 期 2, 页码 350-360出版社
ELSEVIER
DOI: 10.1016/j.optmat.2008.05.006
关键词
Nonlinear optics; Optical nonlinearities in organic materials; Kerr effect; Self-action effects; Liquid crystals; Z-Scan
资金
- Telmex Founclation
- SEP-CONACyT [U-49846F, 34921-E]
- DGAPA-UNAM [34921-E]
We report in this work on the simultaneous presence of both positive and negative nonlinear optical (NLO) refractive indexes measured in methyl-red dye doped 5CB liquid crystal (LC). Characterization of these materials was performed according to the Z-Scan technique under cw He-Ne laser irradiation, taking into account the polarization and temperature dependence of the NLO-refractive index, and how these parameters are related to local and nonlocal mechanisms. The experimental conditions and a possible explanation for the simultaneous presence of positive and negative nonlinear refractive indexes are carefully discussed. (C) 2008 Elsevier B.V. All rights reserved.
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