Abstract
Colloidal suspensions of nematic liquid crystal (NLC) doped with graphene oxide (GO) were prepared and their third-order nonlinear optical (NLO) response χ(3), nonlinear refractive index (NLR), and nonlinear absorption coefficient (NLA) were investigated using Z-scan technique employing He: Ne laser at 632.8nm. GO doped system exhibits a significantly different nonlinear optical response compared to pure NLC and the highest nonlinearity was observed at the system including 0.75% GO.The results of GO doped NLC show that the external field changes the NL parameter are dependent upon the electrical field direction since it affects the director axis, n→, compared to their initial orientation. The external field is applied perpendicular to the cell surface. The χ(3) change value was measured as the applied electrical filed varies. The mentioned studies were carried out without and under the electric field effect using different AC voltages. The value of NLO, NLA and χ(3) in present of electric field were more significant compare without of electric field. Additionally, the optical limiting (OL) behavior of colloidal suspensions was investigated. The obtained results provide new useful information about the NLO properties of NLC's nanocomposite in particular to design optical limiting devices and also other photonic applications.
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