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Effect of ballistic electrons on ultrafast thermomechanical responses of a thin metal film

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【Author】 Qi-lin Xiong;Xin Tian;Department of Mechanics, Huazhong University of Science & Technology;Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment;School of Mechanical Engineering, Xi’an Jiaotong University;

【机构】 Department of Mechanics,Huazhong University of Science & Technology； Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment； School of Mechanical Engineering,Xi’an Jiaotong University；

【摘要】 The ultrafast thermomechanical coupling problem in a thin gold film irradiated by ultrashort laser pulses with different electron ballistic depths is investigated via the ultrafast thermoelasticity model. The solution of the problem is obtained by solving finite element governing equations. The comparison between the results of ultrafast thermomechanical coupling responses with different electron ballistic depths is made to show the ballistic electron effect. It is found that the ballistic electrons have a significant influence on the ultrafast thermomechanical coupling behaviors of the gold thin film and the best laser micromachining results can be achieved by choosing the specific laser technology(large or small ballistic range).In addition, the influence of simplification of the ultrashort laser pulse source on the results is studied, and it is found that the simplification has a great influence on the thermomechanical responses, which implies that care should be taken when the simplified form of the laser source term is applied as the Gaussian heat source.更多还原

【Abstract】 The ultrafast thermomechanical coupling problem in a thin gold film irradiated by ultrashort laser pulses with different electron ballistic depths is investigated via the ultrafast thermoelasticity model. The solution of the problem is obtained by solving finite element governing equations. The comparison between the results of ultrafast thermomechanical coupling responses with different electron ballistic depths is made to show the ballistic electron effect. It is found that the ballistic electrons have a significant influence on the ultrafast thermomechanical coupling behaviors of the gold thin film and the best laser micromachining results can be achieved by choosing the specific laser technology(large or small ballistic range).In addition, the influence of simplification of the ultrashort laser pulse source on the results is studied, and it is found that the simplification has a great influence on the thermomechanical responses, which implies that care should be taken when the simplified form of the laser source term is applied as the Gaussian heat source.更多还原

【关键词】 ultrafast thermomechanical coupling； ballistic electrons； ultrashort laser pulse； finite element method；
【Key words】 ultrafast thermomechanical coupling； ballistic electrons； ultrashort laser pulse； finite element method；

【基金】 Project supported by the National Natural Science Foundation of China(Grant No.11502085);the Natural Science Foundation of Hubei Province,China(Grant No.2016CFB542);the Fundamental Research Funds for the Central Universities,China(Grant No.2016YXMS097);the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures(NUAA),China(Grant No.0315K01)

【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2017年09期

【分类号】O484
【下载频次】7

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