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Measuring the nonlinear refractive index of graphene using the optical Kerr effect method. 2016
Evdokia Dremetsika, and
Bruno Dlubak, and
Simon-Pierre Gorza, and
Charles Ciret, and
Marie-Blandine Martin, and
Stephan Hofmann, and
Pierre Seneor, and
Daniel Dolfi, and
Serge Massar, and
Philippe Emplit, and
Pascal Kockaert
By means of the ultrafast optical Kerr effect method coupled to optical heterodyne detection (OHD-OKE), we characterize the third-order nonlinear response of graphene and compare it to experimental values obtained by the Z-scan method on the same samples. From these measurements, we estimate a negative nonlinear refractive index for monolayer graphene, n2=-1.1×10-13 m2/W. This is in contradiction to previously reported values, which leads us to compare our experimental measurements obtained by the OHD-OKE and the Z-scan method with theoretical and experimental values found in the literature and to discuss the discrepancies, taking into account parameters such as doping.
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