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Resonant enhancement of nonlinear absorption and ultrafast dynamics of WS2 nanosheets

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Abstract

The comparative study on nonlinear absorption of WS2 nanosheets was performed by using nanosecond Z-scan measurements at 532 nm and 500 nm. It was found that, WS2 nanosheets exhibit saturable absorption (SA) at low excitation intensities, and the saturable intensity at 500 nm is much stronger than that at 532 nm, which implies that resonance plays main role. With the increase of incident intensity, a switch from SA to reverse saturable absorption (RSA) occurs. Besides, ultrafast dynamics of WS2 nanosheets were investigated by using femtosecond pump-probe technique. Photo-dynamics process was found to contain a double exponential energy relaxation with a fast decay component (14 ps) and a slow one (145 ps).

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Acknowledgements

This work was supported by the Natural Science Foundation of Heilongjiang Province (F2018027), Heilongjiang University Graduate Innovation Fund (YJSCX2018-015HLJU), East University of Heilongjiang Scientific Research Fund (HDFKY190106).

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Shao, Y., Chen, C., Han, J. et al. Resonant enhancement of nonlinear absorption and ultrafast dynamics of WS2 nanosheets. Opt Quant Electron 52, 300 (2020). https://doi.org/10.1007/s11082-020-02421-6

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