Ultrafast optical response and ablation mechanisms of molybdenum disulfide under intense femtosecond laser irradiation

Changji Pan; Lan Jiang; Jingya Sun; Qingsong Wang; Feifei Wang; Kai Wang; Yongfeng Lu; Yeliang Wang; Liangti Qu; Tianhong Cui

doi:10.1038/s41377-020-0318-8

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Ultrafast optical response and ablation mechanisms of molybdenum disulfide under intense femtosecond laser irradiation

Original Articles

- Ultrafast optical response and ablation mechanisms of molybdenum disulfide under intense femtosecond laser irradiation
- Light: Science & Applications Vol. 9, Issue 3, Pages: 775-782(2020)
- Affiliations：
  
  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
- Author bio：
  
  Lan Jiang (jianglan@bit.edu.cn)
- Funds：
- DOI：10.1038/s41377-020-0318-8
  CLC：
- Published：2020，
  
  Published Online：06 May 2020，
  
  Received：09 October 2019，
  
  Revised：10 April 2020，
  
  Accepted：19 April 2020
- Accepted：
Scan QR Code
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：

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.

摘要

Abstract

Numerous valuable studies on electron dynamics have focussed on the extraordinary properties of molybdenum disulfide (MoS

); however

most of them were confined to the level below the damage threshold. Here the electron dynamics of MoS

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

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

above the damage threshold and are helpful for understanding the interaction mechanism between MoS

and intense ultrafast lasers

as well as for MoS

processing applications.

关键词

Keywords

references

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