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Title: Z-scan measurement of the nonlinear refractive index of graphene
Authors: Zhang, H.
Virally, S.
Bao, Q. 
Kian Ping, L. 
Massar, S.
Godbout, N.
Kockaert, P.
Issue Date: 1-Jun-2012
Source: Zhang, H., Virally, S., Bao, Q., Kian Ping, L., Massar, S., Godbout, N., Kockaert, P. (2012-06-01). Z-scan measurement of the nonlinear refractive index of graphene. Optics Letters 37 (11) : 1856-1858. ScholarBank@NUS Repository.
Abstract: Under strong laser illumination, few-layer graphene exhibits both a transmittance increase due to saturable absorption and a nonlinear phase shift. Here, we unambiguously distinguish these two nonlinear optical effects and identify both real and imaginary parts of the complex nonlinear refractive index of graphene. We show that graphene possesses a giant nonlinear refractive index n2 ≃ 10-7 cm2 W-1, almost 9 orders of magnitude larger than bulk dielectrics. We find that the nonlinear refractive index decreases with increasing excitation flux but slower than the absorption. This suggests that graphene may be a very promising nonlinear medium, paving the way for graphene-based nonlinear photonics. © 2012 Optical Society of America.
Source Title: Optics Letters
ISSN: 01469592
DOI: 10.1364/OL.37.001856
Appears in Collections:Staff Publications

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