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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 11 — Jun. 1, 2012
  • pp: 1856–1858

Z-scan measurement of the nonlinear refractive index of graphene

Han Zhang, Stéphane Virally, Qiaoliang Bao, Loh Kian Ping, Serge Massar, Nicolas Godbout, and Pascal Kockaert  »View Author Affiliations

Optics Letters, Vol. 37, Issue 11, pp. 1856-1858 (2012)

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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 n2107cm2W1, 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

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(190.3270) Nonlinear optics : Kerr effect
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(160.4236) Materials : Nanomaterials

ToC Category:

Original Manuscript: December 2, 2011
Revised Manuscript: February 8, 2012
Manuscript Accepted: March 12, 2012
Published: May 21, 2012

Han Zhang, Stéphane Virally, Qiaoliang Bao, Loh Kian Ping, Serge Massar, Nicolas Godbout, and Pascal Kockaert, "Z-scan measurement of the nonlinear refractive index of graphene," Opt. Lett. 37, 1856-1858 (2012)

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Fig. 1. Fig. 2. Fig. 3.

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