Enhancement of nonlinear absroption and optical limiting properties of graphene oxide in mixed with Fe2O3 nanoparticles

In this research, graphene oxide (GO) was mixed with Fe2O3 nanoparticles by using sonication with 10:1 volume ratio. The nonlinear absorption of graphene oxide, Fe2O3 nanoparticles, and the mixture of GO- Fe2O3 were studied by using open aperture Z-scan method. Also the optical limiting of these materials were investigated. It was observed that the nonlinear absorption and optical limiting of graphene oxide has been increased when mixed with Fe2O3 nanoparticles. The light source that was used in all experiments was a continuous wave laser diode at 532 nm wavelength. In Fe2O3 nanoparticles a switch over from saturable absorption to reverse saturable absorption behavior with increasing the input intensity was observed. In GO and GO-Fe2O3 samples with increasing intensity the depth of vally in open aperture Z-scan curves increased and their nonlinear absorption coefficient rose to an optimal value. It was also observed that in GO-Fe2O3 mixture by increasing the length of sample, optical limiting power increased.