Boosting the nonlinear optical absorption of graphene oxide, and gold nanorods by tailoring graphene oxide-gold nanorods hybrids

Tailoring efficient nonlinear optical materials continues to be a topic of great interest in the scientific field. In this paper, we study the nonlinear response of graphene oxide nanosheets GO, gold nanorods AuNRs, and graphene oxide/gold nanorods hybrid nanocomposite GO@AuNRs respectively, GO was prepared by modified Hummer method while AuNRs were prepared by the seed-mediated method and GO@AuNRs prepared by simple ex-situ method. The nonlinear absorption was measured via open aperture Z scan using nanosecond pulses at 532 nm, The nonlinear absorption coefficients were measured for the proposed materials in colloidal and polymeric forms. The results show an enhancement of the nonlinear absorption and optical limiting of GO@AuNRs over GO and AuNRs. Furthermore, enhanced optical nonlinearity and stability are achieved in polymeric form compared to colloidal forms. These materials could potentially be used in optical limiting applications and photonic devices. The nonlinear optical absorption of three different materials-graphene oxide nanosheets (GO), gold nanorods (AuNRs), and a hybrid of the two known as GO@AuNRs-was examined in this study.The findings revealed that GO@AuNRs had better nonlinear absorption and optical limiting properties than GO and AuNRs alone. In addition, the materials' optical nonlinearity and stability were improved in the polymer-based form compared to their colloidal counterparts.These results imply that these materials have a promising future for use in optical limiting and photonic devices.