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Measuring the nonlinear refractive index of graphene using the optical Kerr effect method

par Dremetsika, Evdokia ;Dlubak, Bruno;Gorza, Simon-Pierre ;Ciret, Charles ;Martin, Marie-Blandine;Hofmann, Stephan;Seneor, Pierre;Dolfi, Daniel;Massar, Serge ;Emplit, Philippe ;Kockaert, Pascal
Référence Optics Letters, 41, 14, page (3281-3284)
Publication Publié, 2016-07-15

Article révisé par les pairs

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Résumé :

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.