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We have investigated the characteristics of high harmonic and attosecond pulse generated by helium atom exposed to the combined field of two laser pulses with the same color and a midinfrared laser pulse in nano-structure plasmon by solving the one-dimensional time-dependent Schrödinger equation. It is shown that the cut-off position of the harmonics is obviously extended in the combined field, however, the plasmon structure determined effect of absorbing the electron in the continuum states has an important influence on the cut-off position of the harmonics. It is found that the contribution from some single trajectory of electron is enhanced and other trajectories are suppressed by changing the plasmon position, so a single isolated attosecond pulse is obtained. Comparison with the scenario of atoms driven in homogeneous field, the width of the pulse decreases greatly, and an isolated pulse is achieved to be as short as 28 attoseconds.
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Keywords:
- plasmon /
- high-order harmonic /
- attosecond pulse
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[1] Goulielmakis E, Schultze M, Hofstetter M, et al. 2008 Science 320 1614
[2] Zhao K, Zhang Q, Chini M, et al. 2012 Opt. Lett. 37 3891
[3] Krausz F, Ivanov M 2009 Rev. Mod. Phys. 81 163
[4] Chini M, Zhao K, Chang Z 2014 Nature Photon. 8 178
[5] Witting T, Frank F, Okell W A, et al. 2012 J. Phys. B 45 074014
[6] Abel M, Pfeifer T, Nagel P M, et al. 2009 Chem. Phys. 366 9
[7] Sansone G, Benedetti E, Calegari F 2006 Science 314 443
[8] Corkum P B 1993 Phys. Rev. Lett. 71 1994
[9] Tate J, Auguste T, Muller H G, et al. 2007 Phys. Rev. Lett. 98 013901
[10] Frolov M V, Manakov N L, Starace A F 2008 Phys. Rev. Lett. 100 173001
[11] Xia C L, Liu X S 2012 Acta Phys. Sin. 61 043303 (in Chinese) [夏昌龙, 刘学深 2012 61 043303]
[12] Hong W Y, Yang Z Y, Lan P F, Zhang Q B, Li Q G, Lu P X 2009 Acta Phys. Sin. 58 4914 (in Chinese) [洪伟毅, 杨振宇, 兰鹏飞, 张庆斌, 李钱光, 陆培祥 2009 58 4914]
[13] Zou P, Li R X, Zeng Z N, Xiong H, Liu P, Leng Y X, Fan P Z, Xu Z Z 2010 Chin. Phys. B 19 019501
[14] Lu R F, He H X, Guo Y H, Han K L 2009 J. Phys. B 42 22560
[15] Orlando G, Corso P P, Fiordilino E 2009 J. Mod. Opt. 56 1761
[16] Xiang Y, Niu Y P, Gong S Q 2009 Phys. Rev. A 79 053419
[17] Zhang G T, Bai T T, Zhang M G 2012 Chin. Phys. B 21 054214
[18] Chen J G, Yang Y J, Chen Y 2011 Acta Phys. Sin. 60 033202 (in Chinese) [陈基根, 杨玉军, 陈漾 2011 60 033202]
[19] Li P C, Zhou X X, Wang G L, Zhao Z X 2009 Phys. Rev. A 80 053825
[20] Kim S, Jin J, Kim Y, Park I Y 2008 Nature 453 757
[21] Ciappina M F, Biegert J, Quidant R, Lewenstein M 2012 Phys. Rev. A 85 033828
[22] Bumett K, Reed V C, Cooper J, Knight P L 1992 Phys. Rev. A 45 3347
[23] Antoine P, Piraux B, Maquet A 1995 Phys. Rev. A 51 R1750
[24] Pérez-Hernánde J A, Hoffmann D J, Zaïr A, et al. 2009 J. Phys. B 42 134004
[25] Pan H L, Wang G L, Zhou X X 2011 Chin. Sci. Bull. 31 2561 (in Chinese) [潘慧玲, 王国利, 周效信 2011 科学通报 31 2561]
[26] Yavuz I 2013 Phys. Rev. A 87 053815
[27] Yavuz I, Bleda E A, Altun Z, Topcu T 2012 Phys. Rev. A 85 013416
[28] Czaplicki R, Husu H, Siikannen R, et al. 2013 Phys. Rev. Lett. 110 093902
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