EFFECTS OF LASER FLUENCE ON SURFACE NANOSTRUCTURING WITH A LASER-ASSISTED SCANNING TUNNELING MICROSCOPE
In this work, molecular dynamics simulation is performed to explore the long-time (up to 5 ns) behavior of argon crystal in surface nanostructuring with a laser-assisted scanning tunneling microscope. The surface nanostructuring region is limited to tens of nanometers in diameter although the simulated systems are much larger (more than 300,000 of atoms inside). This study is focused on the long-time solidification and crystallization procedure, which is driven by the heat conduction in the material. The effect of the computational domain on the final nanostructuring result is studied in detail. Different laser fluences are used in the simulation to explore how and to what extent the energy input affects the dimension and profile of the surface nanostructure. Meanwhile, spot-like structural defects inthe sub-surface region are in vestigated during the solidification.Additionally, the evolutions of surface melting depth and lowest position in the whole process reveal the impact of different laser fluence on surface nanostructuring from another aspect.
Xuhui Feng Xinwei Wang
Department of Mechanical Engineering N104 Walter Scott Engineering Center University of Nebraska-LincolnLincoln, NE 68588-0656
国际会议
海南三亚
英文
2007-01-10（万方平台首次上网日期，不代表论文的发表时间）