Simultaneous exhibition of positive and negative nonlinear refractive index in dye-doped liquid crystal in a Z-scan experiment

M. D. Iturbe-Castillo; R. Ramos-García; A. A. Rodriguez-Rosales

doi:10.1117/12.681309

15 September 2006 Simultaneous exhibition of positive and negative nonlinear refractive index in dye-doped liquid crystal in a Z-scan experiment

M. D. Iturbe-Castillo, R. Ramos-García, A. A. Rodriguez-Rosales

Author Affiliations +

Proceedings Volume 6332, Liquid Crystals X; 63320U (2006) https://doi.org/10.1117/12.681309
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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.

Citation Download Citation

M. D. Iturbe-Castillo, R. Ramos-García, and A. A. Rodriguez-Rosales "Simultaneous exhibition of positive and negative nonlinear refractive index in dye-doped liquid crystal in a Z-scan experiment", Proc. SPIE 6332, Liquid Crystals X, 63320U (15 September 2006); https://doi.org/10.1117/12.681309

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