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Absorption Saturation and Two-Photon Absorption in Graphene

Published online by Cambridge University Press:  21 August 2014

Weiqiang Chen ,
Yu Wang  and
Wei Ji
Weiqiang Chen
Affiliation:
National University of Singapore, Singapore
Yu Wang
Affiliation:
National University of Singapore, Singapore
Wei Ji*
Affiliation:
National University of Singapore, Singapore
*
#Email Address: phyjiwei@nus.edu.sg
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Abstract

We have investigated the photon-energy dependence of nonlinear optical absorption in graphene in the near infrared (NIR) and visible range (1.13 – 3.1 eV). Two nonlinear processes, namely one-photon interband absorption saturation and two-photon absorption (2PA), have been unambiguously determined in high-quality, CVD-grown, multilayer graphene films with using femtosecond Z-scan technique. The absorption saturation is found to have a square dependence on the photon energy. The 2PA spectrum is measured to be close to the theoretical prediction of ω-4 dependence at NIR wavelengths. In the visible range, however, the photon-energy dependence of 2PA is dominated by the excitonic Fano resonance.

Keywords

chemical vapor deposition (CVD) (deposition)optical propertiesabsorption
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1698: Symposium JJ – Materials, Processes and Devices for Nanophotonics, Nonlinear Optics and Resonant Optics , 2014 , mrss14-1698-jj02-04
Copyright
Copyright © Materials Research Society 2014 

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