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The nonlinear refraction (NLR) properties of graphene oxide (GO) in N, N-Dimethylformamide (DMF) was studied in nanosecond, picosecond and femtosecond time regimes by Z-scan technique. Results show that the dispersion of GO in DMF exhibits negative NLR properties in nanosecond time regime, which is mainly attributed to transient thermal effect in the dispersion. The dispersion also exhibits negative NLR in picosecond and femtosecond time regimes, which are arising from sp(2)- hybridized carbon domains and sp(3)- hybridized matrix in GO sheets. To illustrate the relations between NLR and nonlinear absorption (NLA), NLA properties of the dispersion were also studied in nanosecond, picosecond and femtosecond time regimes.


Xiao-Liang Zhang, Zhi-Bo Liu, Xiao-Chun Li, Qiang Ma, Xu-Dong Chen, Jian-Guo Tian, Yan-Fei Xu, Yong-Sheng Chen. Transient thermal effect, nonlinear refraction and nonlinear absorption properties of graphene oxide sheets in dispersion. Optics express. 2013 Mar 25;21(6):7511-20

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PMID: 23546133

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