1.Laser Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 100081 Beijing, P.R. China
2.Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, USA
3.School of Information and Electronics, Beijing Institute of Technology, 100081 Beijing, P.R. China
4.Key Laboratory for Advanced Materials Processing Technology, Ministry of Education of China, Department of Mechanical Engineering, Tsinghua University, 100084 Beijing, P.R. China
5.Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
Lan Jiang (jianglan@bit.edu.cn)
纸质出版日期:2020,
网络出版日期:2020-05-06,
收稿日期:2019-10-09,
修回日期:2020-04-10,
录用日期:2020-04-19
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Ultrafast optical response and ablation mechanisms of molybdenum disulfide under intense femtosecond laser irradiation[J]. LSA, 2020,9(3):775-782.
Pan, C. J. et al. Ultrafast optical response and ablation mechanisms of molybdenum disulfide under intense femtosecond laser irradiation. Light: Science & Applications, 9, 775-782 (2020).
Ultrafast optical response and ablation mechanisms of molybdenum disulfide under intense femtosecond laser irradiation[J]. LSA, 2020,9(3):775-782. DOI: 10.1038/s41377-020-0318-8.
Pan, C. J. et al. Ultrafast optical response and ablation mechanisms of molybdenum disulfide under intense femtosecond laser irradiation. Light: Science & Applications, 9, 775-782 (2020). DOI: 10.1038/s41377-020-0318-8.
Numerous valuable studies on electron dynamics have focussed on the extraordinary properties of molybdenum disulfide (MoS
2
); however
most of them were confined to the level below the damage threshold. Here the electron dynamics of MoS
2
under intense ultrafast laser irradiation was investigated by experiments and simulations. Two kinds of ablation mechanisms were revealed
which led to two distinct types of electron dynamics and final ablation morphology. At a higher fluence
the emergence of superheated liquid induced a dramatic change in the transient reflectivity and micro-honeycomb structures. At a lower fluence
the material was just removed by sublimation
and the ablation structure was relatively flat. X-ray photoelectron spectroscopic (XPS) measurements demonstrated that thermal decomposition only occurred at the higher fluence. Furthermore
a theoretical model was developed to deeply reveal the ultrafast dynamics of MoS
2
ablation. The simulation results were in good agreement with the temporal and spatial reflectivity distribution obtained from the experiment. The electron and lattice temperature evolution was also obtained to prove the ablation mechanism. Our results revealed ultrafast dynamics of MoS
2
above the damage threshold and are helpful for understanding the interaction mechanism between MoS
2
and intense ultrafast lasers
as well as for MoS
2
processing applications.
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