数值模拟飞秒激光加热金属的热电子发射

陈安民; 高勋; 姜远飞; 丁大军; 刘航; 金明星

doi:10.7498/aps.59.7198

摘要

研究了超短超强激光脉冲与薄膜靶相互作用中产生的电子热发射.当超短激光脉冲与薄膜靶相互作用时,首先入射超短脉冲激光对吸收深度内的自由电子进行热激发,接下来热激发电子将能量传递到附近的晶格,再通过电子和晶格二体系的热传导,以及电子晶格间的热耦合,将能量传递到材料的内部.因此,电子在皮秒级甚至更短的时间内不能与晶格进行能量耦合,使电子温度超出晶格温度很多,电子热发射就变得非常明显了.用双温方程联合Richardson-Dushman方程的方法对飞秒脉冲激光照射金属靶的电子热发射进行了研究,结果发现电子热发射对飞

关键词:

Abstract

The whole process of the electron thermal emission by ultrafast pulsed laser is studied in the paper. When an ultra-short laser pulse interaction with the target film, first of all, the incident laser excites free electrons within the absorption depth, next, electron energy is transferred to nearby lattice through the heat transfer systems of the free electron and lattice, and by the thermal coupling between the electron and the lattice, the energy is delivered to the internal material. Therefore, in a short period of ps and shorter, the energy coupling of the electron and lattice can not be established. So that the electron temperature is much higher than the lattice temperature, the electron thermal emission becomes apparent. The characteristics of thermionic emission of the films during ultrashort pulse laser ablation are investigated using two-temperature model coupled with the Richardson-Dushman equation. It is found that electron thermal emission can significantly change the development of electron and lattice temperatures, meanwhile, the film thickness and laser fluence directly affect electron thermal emission.

Keywords:

作者及机构信息

1.
吉林大学原子与分子物理研究所,长春 130012

基金项目: 国家自然科学基金(批准号:10534010)资助的课题.

Authors and contacts

1.
Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China

参考文献

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[12]	Allen P B 1987 Phys. Rev. Lett. 59 1460
[13]	Wang X Y, Riffe D M, Lee Y S 1994 Phys. Rev.B 50 8016
[14]	Huang J, Zhang Y W, Chen J K 2009 Appl. Phys. A 95 643
[15]	Qiu T Q, Tin C L 1993 J. Heat Trans. 115 835
[16]	Unal A A, Stalmashonak A, Seifert G, Graener H 2009 Phys. Rev.B 79 115411
[17]	Chen J K, Beraun J E 2003 J. Opt. A: Pure Appl. Opt. 5 168
[18]	Kim J, Na S 2007 Opt. Laser Technol. 39 1443
[19]	Yang J J, Liu W W, Zhu X N 2007 Chin. Phys. 16 2003
[20]	Tang J 2008 Appl. Phys. Lett. 92 11901
[21]	Tai P T, Yu P, Tang J 2009 J. Phys. Chem. C 113 15014
[22]	Smith A L, Breitwieser R 1970 J. Appl. Phys. 41 436
[23]	Jiang L, Tsai H L 2006 J. Appl. Phys. 100 23116
[24]	Jiang L, Tsai H L 2005 J. Heat Trans.127 1167
[25]	Christensen B H, Vestentoft K, Balling P 2006 Appl. Surf. Sci. 253 6347

施引文献

[1]	Nolte S, Momma C, Jacobs H 1997 J. Opt. Soc. Am. B 14 2716
[2]	Bulgakova N M 2004 Phys. Rev. B 69 54102
[3]	Gu Y Q, Cai D F, Zheng Z J, Yang X D, Zhou W M, Jiao C Y, Chen H, Wen T S, Chunyu S T 2005 Acta Phys. Sin. 54 186 (in Chinese)[谷渝秋、蔡达锋、郑志坚、杨向东、周维民、焦春晔、陈豪、温天舒、淳于书泰 2005 物理学报54 186]
[4]	Xu M H, Liang T J, Zhang J 2006 Acta Phys. Sin. 55 2357 (in Chinese) [徐妙华、梁天骄、张杰 2006物理学报55 2357]
[5]	Li K, Li Y T, Zhang J, Yuan X H, Xu M H, Wang Z H, Zhang J 2006 Acta Phys. Sin. 55 5909 (in Chinese) [李昆、李玉同、张军、远晓辉、徐妙华、王兆华、张杰 2006物理学报 55 5909]
[6]	Huang W Z, Li Y T, Xiong Y, Zhang S G, Wen X L, Hong W, Gu Y Q, Wen T S, He Y L 2008 Acta Phys. Sin. 57 111 (in Chinese) [黄文忠、李玉同、熊勇、张双根、温贤伦、洪伟、谷渝秋、温天舒、何颖玲 2008物理学报 57 111]
[7]	Corkum P B, Brunel F, Sherman N K 1988 Phys. Rev. Lett. 61 2886
[8]	Zhigilei L V, Lin Z B, Ivanov D S 2009 J. Phys. Chem. C 113 11892
[9]	Cheng J, Perrie W, Sharp M, Edwardson S P 2009 Appl. Phys. A 95 739
[10]	Gan Y, Chen J K 2009 Appl. Phys. Lett. 94 201116
[11]	Hu D Z 2009 Acta Phys. Sin. 58 1077 (in Chinese) [胡德志 2009 物理学报 58 1077]
[12]	Allen P B 1987 Phys. Rev. Lett. 59 1460
[13]	Wang X Y, Riffe D M, Lee Y S 1994 Phys. Rev.B 50 8016
[14]	Huang J, Zhang Y W, Chen J K 2009 Appl. Phys. A 95 643
[15]	Qiu T Q, Tin C L 1993 J. Heat Trans. 115 835
[16]	Unal A A, Stalmashonak A, Seifert G, Graener H 2009 Phys. Rev.B 79 115411
[17]	Chen J K, Beraun J E 2003 J. Opt. A: Pure Appl. Opt. 5 168
[18]	Kim J, Na S 2007 Opt. Laser Technol. 39 1443
[19]	Yang J J, Liu W W, Zhu X N 2007 Chin. Phys. 16 2003
[20]	Tang J 2008 Appl. Phys. Lett. 92 11901
[21]	Tai P T, Yu P, Tang J 2009 J. Phys. Chem. C 113 15014
[22]	Smith A L, Breitwieser R 1970 J. Appl. Phys. 41 436
[23]	Jiang L, Tsai H L 2006 J. Appl. Phys. 100 23116
[24]	Jiang L, Tsai H L 2005 J. Heat Trans.127 1167
[25]	Christensen B H, Vestentoft K, Balling P 2006 Appl. Surf. Sci. 253 6347

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