Abstract
Nonlinear optics (NLO) has attracted much attention for its immense potential in applications. However, it typically requires very high light intensities. Recently, we reported that polymer stabilization efficiently enhances the self-focusing effect for dye-doped liquid crystals (LCs). Here we studied the effect of polymer concentration on self-focusing in the dye-doped polymer-stabilized LC (PSLC). Oligothiophene (TR5)-doped PSLCs with different polymer concentrations were prepared, and self-diffraction ring measurement was performed. As polymer concentration increased, the threshold light intensity for self-focusing effect first decreased then slightly increased. The lowest threshold light intensity of 3.4 W/cm2 was obtained at 10 mol%. Polymer stabilization of the LCs decreased the threshold intensity by a factor of 7. We also discussed the possible mechanism for the polymer concentration dependence of NLO response in the TR5-doped PSLC.
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