Direct Observation of Degenerate Two-Photon Absorption and Its Saturation in WS2 and MoS2 Monolayer and Few-Layer Films.

@article{Zhang2015DirectOO,
  title={Direct Observation of Degenerate Two-Photon Absorption and Its Saturation in WS2 and MoS2 Monolayer and Few-Layer Films.},
  author={Saifeng Zhang and Ningning Dong and Niall McEvoy and Maria O'Brien and Sinead Winters and Nina C Berner and Chanyoung Yim and Yuanxin Li and Xiao-yan Zhang and Zhanghai Chen and Long Zhang and Georg S. Duesberg and Jun Wang},
  journal={ACS nano},
  year={2015},
  volume={9 7},
  pages={
          7142-50
        }
}
The optical nonlinearity of WS2 and MoS2 monolayer and few-layer films was investigated using the Z-scan technique with femtosecond pulses from the visible to the near-infrared range. The nonlinear absorption of few- and multilayer WS2 and MoS2 films and their dependences on excitation wavelength were studied. WS2 films with 1-3 layers exhibited a giant two-photon absorption (TPA) coefficient as high as (1.0 ± 0.8) × 10(4) cm/GW. TPA saturation was observed for the WS2 film with 1-3 layers and… 
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