Nonlinear Optical Properties of Graphene Oxide and Reduced Graphene Oxide

In this work, we studied the third- order nonlinear optical (NLO) response of graphene oxide (GO) andreduced graphene oxide (RGO) sheets dispersed in water under visible (633nm) laser excitations. The NLO and optical limiting (OL) properties of the suspensions were investigated by Z-scan technique. Both GO and RGO were found to exhibit large NLO response, while significant differences on their nonlinear optical response have been observed (e.g. different sign of nonlinear refraction and absorption). These findings highlight the important role of oxidation degree and sp2/sp3 orbital ratio of the graphene sheets on their optical and electronic properties foroptoelectronics applications.

Keywords:

Graphene , Optical properties , Nonlinear optics , Transmittance