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Nonlinear optical properties of multilayer graphene in the infrared.
Optics Express 2016 June 14
A negative value for the nonlinear refraction in graphene is experimentally observed and unambiguously verified by performing a theoretical analysis arising from the conductivity of the graphene monolayer. The nonlinear optical properties of multi-layer graphene are experimentally studied by employing the Z-scan technique. The measurements are carried out at 1150, 1550, 1900 and 2400 nm with a 100-femtosecond laser source. Under laser illumination the multi-layer graphene exhibits a transmittance increase due to saturable absorption, followed by optical limiting due to two-photon absorption. The saturation irradiance Isat and the two-photon absorption coefficient β are measured in the operating wavelength range. Furthermore, an irradiance-dependent nonlinear refraction is observed and discriminated from the conventional nonlinear refraction coefficient n2<sub>,</sub> which is not irradiance dependent. The values obtained for the irradiance-dependent nonlinear refraction are in the order of ∼10<sup>-9</sup> cm<sup>2</sup>W<sup>-1</sup>, approximately 8 orders of magnitude larger than any bulk dielectrics.
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