Measurement of non-linear optical properties in graphene oxide using the Z-scan technique.

We report the value of non-linear optical parameters in graphene oxide (GO) using the Z-scan technique. The value of the non-linear refractive index η, non-linear absorption coefficient β and the complex value of third order susceptibility χ in samples with different concentrations of GO diluted in distilled water were determined. The value of these parameters were obtained directly from the measurement of normalized transmittance of each sample as a consequence of its non-linear response when are exposed to electromagnetic radiation from a Nd:YAG laser emitting at 532 nm in CW mode. In addition, we found that the parameters η, β and χ growth by increasing excitation laser power, where β showed an high order of magnitude around ~10 cm/W.