Giant Two-Photon Absorption in Bilayer Graphene

被引：195

作者：

Yang, Hongzhi ^{[1
]}

Feng, Xiaobo ^{[1
,2
]}

Wang, Qian ^{[1
]}

Huang, Han ^{[1
]}

Chen, Wei ^{[1
,3
]}

Wee, Andrew T. S. ^{[1
]}

Ji, Wei ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[2] Yunnan Normal Univ, Sch Phys & Elect Informat Technol, Kunming 650092, Peoples R China

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

来源：

NANO LETTERS | 2011年 / 11卷 / 07期

关键词：

Bilayer graphene; two-photon absorption; second-order perturbation thoery; Z-scan; ballistic photocurrent; EPITAXIAL GRAPHENE; RAMAN-SPECTRA; CARBON; 6H-SIC(0001); GRAPHITE; FILMS;

D O I：

10.1021/nl200587h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present a quantum perturbation theory on two-photon absorption (2PA) in monolayer and bilayer graphene which is Bernal-stacked. The theory shows that 2PA is significantly greater in bilayer graphene than monolayer graphene in the visible and infrared spectrum (up to 3 mu m) with a resonant 2PA coefficient of up to similar to 0.2 cm/W located at half of the bandgap energy, gamma(1) = 0.4 eV. In the visible and terahertz region, 2PA exhibits a light frequency dependence of omega(-3) in bilayer graphene, while it is proportional to omega(-4) for monolayer graphene at all photon energies. Within the same order of magnitude, the 2PA theory is in agreement with our Z-scan measurements on high-quality epitaxial bilayer graphene deposited on SiC substrate at light wavelength of 780 and 1100 nm.

引用

页码：2622 / 2627

页数：6

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