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 η₂, non-linear absorption coefficient β and the complex value of third order susceptibility χ⁽³⁾ 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 η₂, β and χ⁽³⁾ growth by increasing excitation laser power, where β showed an high order of magnitude around ~10^-2 cm/W.