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Absorption Saturation and Two-Photon Absorption in Graphene

Published online by Cambridge University Press:  21 August 2014

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: [email protected]
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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.

Type
Articles
Copyright
Copyright © Materials Research Society 2014 

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References

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