Ultrafast laser ablation of graphite
Ultrafast laser ablation of graphite
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DOI：
10.1103/physrevb.79.184105
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发表时间：
2009-05-01
影响因子：
3.7
通讯作者：
Palmer, R. E.
中科院分区：
文献类型：
--
作者：
Lenner, M.;Kaplan, A.;Palmer, R. E.
我们结合各种实验技术，包括拉曼光谱，原子力显微镜以及飞行时间光谱研究了单次飞秒激光烧蚀石墨。全面的分析揭示了洞察消融过程中探索的表面结构，能量密度的依赖性，和结构动力学的脱离。结果显示带电碳产物（例如石墨烯纳米片）从表面的形成和脱离。离子产率和速度的时间分辨测量揭示了强烈的猝灭和库仑爆炸的恢复作为延迟时间的函数在100-200 fs的范围内，这表明最顶层的表面层之间的位移运动，调节系统的光学性质。
We have studied single-shot femtosecond laser ablation of graphite by combining a variety of experimental techniques including Raman spectroscopy, atomic force microscopy as well as time of flight spectrometry. The comprehensive analysis reveals insights into the ablation process by exploring the surface structure, the fluence dependence, and the structural dynamics of the detachment. The results show formation and detachment of charged carbon products (such as graphene nanoflakes) from the surface. Time-resolved measurements of ion yields and velocities reveal strong quenching and revival of Coulomb explosion as a function of delay time in the range of 100-200 fs, suggesting a displacive motion between the topmost surface layers which regulates the optical properties of the system.