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Title: Giant two-photon absorption in bilayer graphene
Authors: Yang, H.
Feng, X. 
Wang, Q.
Huang, H. 
Chen, W. 
Wee, A.T.S. 
Ji, W. 
Keywords: ballistic photocurrent
Bilayer graphene
second-order perturbation thoery
two-photon absorption
Issue Date: 13-Jul-2011
Citation: Yang, H., Feng, X., Wang, Q., Huang, H., Chen, W., Wee, A.T.S., Ji, W. (2011-07-13). Giant two-photon absorption in bilayer graphene. Nano Letters 11 (7) : 2622-2627. ScholarBank@NUS Repository.
Abstract: 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 μm) with a resonant 2PA coefficient of up to ∼0.2 cm/W located at half of the bandgap energy, γ1 = 0.4 eV. In the visible and terahertz region, 2PA exhibits a light frequency dependence of ω-3 in bilayer graphene, while it is proportional to ω-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. © 2011 American Chemical Society.
Source Title: Nano Letters
ISSN: 15306984
DOI: 10.1021/nl200587h
Appears in Collections:Staff Publications

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