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Proceedings Paper

Simultaneous exhibition of positive and negative nonlinear refractive index in dye-doped liquid crystal in a Z-scan experiment
Author(s): M. D. Iturbe-Castillo; R. Ramos-García; A. A. Rodriguez-Rosales
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Paper Abstract

Dye-doped nematic liquid crystal samples where the vector director is not pre-aligned exhibits simultaneously positive and negative nonlinear refractive index under cw illumination at room temperature, regardless the polarization state of the illuminating beam. However, its relative contributions are polarization dependent. Experimental Z-scan curves for 100 μm thick methyl red doped 5CB nematic liquid crystals, demonstrate that negative nonlinearity is an order of magnitude larger than the positive. The polarization state of the transmitted beam is change to elliptical carrying information about the positive and negative nonlinearities.

Paper Details

Date Published: 15 September 2006
PDF: 7 pages
Proc. SPIE 6332, Liquid Crystals X, 63320U (15 September 2006); doi: 10.1117/12.681309
Show Author Affiliations
M. D. Iturbe-Castillo, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
R. Ramos-García, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
A. A. Rodriguez-Rosales, UNAM (Mexico)

Published in SPIE Proceedings Vol. 6332:
Liquid Crystals X
Iam-Choon Khoo, Editor(s)

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