Ultrafast Modulation of the Molten Metal Surface Tension under Femtosecond Laser Irradiation  

作　　者：Chenhao Li Hongtao Liang Yang Yang Zhiyong Yu Xin Zhang Xiangming Ma Wenliang Lu Zhenrong Sun Ya Cheng 李辰豪;梁洪涛;杨洋;于志勇;张鑫;马祥明;鲁文亮;孙真荣;程亚(State Key Laboratory of Precision Spectroscopy,School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China)

机构地区：[1]State Key Laboratory of Precision Spectroscopy,School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China

出　　处：《Chinese Physics Letters》2022年第7期117-122,共6页中国物理快报（英文版）

基　　金：the National Key R&D Program of China (Grant No. 2019YFA0705000);the National Natural Science Foundation of China (Grant Nos. 11874147, 11933005, and 12134001);the Science and Technology Commission of Shanghai Municipality (Grant No. 21DZ1101500);the Shanghai Municipal Science and Technology Major Project (Grant No. 2019SHZDZX01);the Natural Science Foundation of Chongqing, China (Grant No. cstc2021jcyj-msxm X1144);the State Key Laboratory of Solidification Processing in NWPU (Grant No. SKLSP202105)。

摘　　要：We predict ultrafast modulation of the pure molten metal surface stress fields under the irradiation of the single femtosecond laser pulse through the two-temperature model molecular-dynamics simulations. High-resolution and precision calculations are used to resolve the ultrafast laser-induced anisotropic relaxations of the pressure components on the time-scale comparable to the intrinsic liquid density relaxation time. The magnitudes of the dynamic surface tensions are found being modulated sharply within picoseconds after the irradiation, due to the development of the nanometer scale non-hydrostatic regime behind the exterior atomic layer of the liquid surfaces.The reported novel regulation mechanism of the liquid surface stress field and the dynamic surface tension hints at levitating the manipulation of liquid surfaces, such as ultrafast steering the surface directional transport and patterning.

关 键 词：RED PROFILE Gibbs Ultrafast Modulation of the Molten Metal Surface Tension under Femtosecond Laser Irradiation 

分 类 号：TN249[电子电信—物理电子学] O35[理学—流体力学]