Abstract
In the present work we elucidate the thermodynamic mechanisms of femtosecond (fs) laser ablation of amorphous polystyrene by means of molecular dynamics (MD) simulations. The effects of extrinsic parameter of laser pulse intensity and intrinsic parameter of molecular architecture on the laser ablation are further studied. Simulation results show that the laser ablation-induced polymeric material removal is achieved by evaporation from the surface and expansion within the bulk. Furthermore, inter-chain sliding and intra-chain change also play important roles in the microscopic deformation of the material. It is found that both the laser pulse intensity and the arrangement of phenyl groups have significant influence on the fs laser ablation of polystyrene.
概要
研究意义
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1)
飞秒激光烧蚀是制备激光约束聚变快点火聚苯乙烯微球靶丸的一个重要手段
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2)
研究聚苯乙烯飞秒激光烧蚀机理对于提高微球表面小孔加工精度具有重要的理论意义与实用价值。
创新要点
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1)
建立了全原子模型的聚苯乙烯飞秒激光烧蚀的分子动力学仿真模型
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2)
研究了飞秒激光烧蚀中聚苯乙烯的微观变形机理及与烧蚀加工结果的关系
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3)
研究了外部激光强度和内部分子结构对聚苯乙烯飞秒激光烧蚀的影响规律。
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Huang, Y., Song, C., Zhang, J. et al. Atomistic investigation of ablation of amorphous polystyrene under femtosecond laser pulse. Sci. China Phys. Mech. Astron. 58, 1–7 (2015). https://doi.org/10.1007/s11433-014-5587-x
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DOI: https://doi.org/10.1007/s11433-014-5587-x