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|Title:||Giant two-photon absorption in bilayer graphene|
second-order perturbation thoery
|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. https://doi.org/10.1021/nl200587h|
|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|
|Appears in Collections:||Staff Publications|
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