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

Author

Zhang, Saifeng, primary, Dong, Ningning, additional, McEvoy, Niall, additional, O’Brien, Maria, additional, Winters, Sinéad, additional, Berner, Nina C., additional, Yim, Chanyoung, additional, Li, Yuanxin, additional, Zhang, Xiaoyan, additional, Chen, Zhanghai, additional, Zhang, Long, additional, Duesberg, Georg S., additional, and Wang, Jun, additional

Published
2015
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3. Direct Observation of Degenerate Two-Photon Absorption and Its Saturation in WS2and MoS2Monolayer and Few-Layer Films

Author

Zhang, Saifeng, Dong, Ningning, McEvoy, Niall, O’Brien, Maria, Winters, Sinéad, Berner, Nina C., Yim, Chanyoung, Li, Yuanxin, Zhang, Xiaoyan, Chen, Zhanghai, Zhang, Long, Duesberg, Georg S., and Wang, Jun

Abstract

The optical nonlinearity of WS2and MoS2monolayer 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 WS2and MoS2films and their dependences on excitation wavelength were studied. WS2films with 1–3 layers exhibited a giant two-photon absorption (TPA) coefficient as high as (1.0 ± 0.8) × 104cm/GW. TPA saturation was observed for the WS2film with 1–3 layers and for the MoS2film with 25–27 layers. The giant nonlinearity of WS2and MoS2films is attributed to a two-dimensional confinement, a giant exciton effect, and the band edge resonance of TPA.

Published
2015
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