Z-scan measurement of the nonlinear refractive index of graphene

被引：594

作者：

Zhang, Han ^{[1
]}

Virally, Stephane ^{[2
]}

Bao, Qiaoliang ^{[3
]}

Ping, Loh Kian ^{[3
]}

Massar, Serge ^{[4
]}

Godbout, Nicolas ^{[2
]}

Kockaert, Pascal ^{[1
]}

机构：

[1] Univ Libre Brussels, OPERA Photon, B-1050 Brussels, Belgium

[2] Ecole Polytech, Dept Engn Phys, Stn Ctr Ville, Montreal, PQ H3C 3A7, Canada

[3] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore

[4] Univ Libre Brussels, Lab Informat Quant, B-1050 Brussels, Belgium

来源：

OPTICS LETTERS | 2012年 / 37卷 / 11期

关键词：

Nonlinear optics - Refractive index;

D O I：

10.1364/OL.37.001856

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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

引用

页码：1856 / 1858

页数：3