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Enhanced optical Kerr effect method for a detailed characterization of the third-order nonlinearity of two-dimensional materials applied to graphene

par Dremetsika, Evdokia ;Kockaert, Pascal
Référence Physical Review B, 96, page (235422)
Publication Publié, 2017

Article révisé par les pairs

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Résumé :

Using an enhanced optically heterodyned optical Kerr effect method and a theoretical description of the interactions between an optical beam, a single layer of graphene, and its substrate, we provide experimental answers to questions raised by theoretical models of graphene third-order nonlinear optical response. In particular, we measure separately the time response of the two main tensor components of the nonlinear susceptibility, we validate the assumption that the out-of-plane tensor components are small, and we quantify the optical impact of the substrate on the measured coefficients. Our method can be applied to other two-dimensional materials, as it relies mainly on the small ratio between the thickness and the wavelength.