Journal
OPTICS LETTERS
Volume 37, Issue 11, Pages 1856-1858Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.37.001856
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Funding
- Belgian Science Policy Office (BELSPO) [IAP-6/10]
- Lee Kuan Yew Postdoctoral Fellowship
- NRF-CRP
- National Science and Engineering Research Council of Canada
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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 n(2) similar or equal to 10(-7) cm(2) 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. (C) 2012 Optical Society of America
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