Variation of nonlinear refractive index in dye-doped liquid crystals by local and nonlocal mechanisms
✍ Scribed by Antonio A. Rodríguez-Rosales; Omar G. Morales-Saavedra; Carlos J. Román-Moreno; Roberto Ortega-Martínez
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 887 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0925-3467
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✦ Synopsis
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.