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Electron-Nuclear Dynamics in Molecular Harmonic Generation Driven by a Plasmonic Nonhomogeneous Field
Feng, Li-Qiang1,2; Li, Wen-Liang1,2,4; Liu, Hang1,3
关键词Molecular High-order Harmonic Generation Plasmon-enhanced Nonhomogeneous Field Ionization Channels Contributions Of Harmonics From Two-h Nuclei MInima In Harmonic Spectra
刊名ANNALEN DER PHYSIK
2017-08-01
DOI10.1002/andp.201700093
529期:8
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Physics, Multidisciplinary
研究领域[WOS]Physics
关键词[WOS]INTENSE LASER FIELDS ; NONLINEAR OPTICS ; ATTOSECOND PULSE ; ENHANCEMENT ; IONIZATION ; EMISSION ; H-2(+)
英文摘要Electron (z)-nuclear (R) dynamics in the molecular high-order harmonic generation (MHHG) from H2+ driven by the plasmonic nonhomogeneous field, generated by the surface plasmon polaritons in the bowtie-shaped nanostructure, have been theoretically investigated through solving the two dimensional time-dependent Schrodinger equation with the Non-Bohn-Oppenheimer approximation. It is found that (i) due to the plasmonic enhancement of the laser intensity, the harmonic cutoff can be extended when the spatial position of H2+ is away from the gap center of the nanostructure. However, due to the limit of the gap size, the threshold value of the harmonic cutoff can be obtained at a given position of H2+. (ii) Due to the asymmetric enhancement of the laser intensity in space, the extended higher harmonics are respectively from E(t) > 0 a.u. or E(t) < 0 a.u. for the cases of the positive and the negative spatial position of H2+. As a result, the intensities of the extended higher harmonics are different and can be controlled by changing the carrier-envelope phase and the pulse duration of the laser field. (iii) In the few-cycle pulse duration, the MHHG mainly comes from the multi-photon resonance ionization (MPRI), while as the pulse duration increases, the MPRI, the charge-resonance enhanced ionization (CREI) and even the dissociative ionization (DI) are contributed to the MHHG. Moreover, as the spatial position of H2+ moves, the contributions of the MHHG from the MPRI, the CERI and the DI can be controlled. (iv) The contributions of the MHHG from the two-H nuclei have been investigated and found that when E(t) > 0 a.u., the intensities of the harmonics from the negative-H is higher than those from the positive-H; while when E(t) < 0 a.u., the intensities of the harmonics from the positive-H plays the main role in the MHHG. Moreover, the multi-minima, caused by the two-center interference can also be found. (v) Finally, by superposing a properly selected harmonics, a single isolated attosecond pulse (SIAP) with the full width at half maximum (FWHM) of 34 as can be obtained.
语种英语
WOS记录号WOS:000409204100017
引用统计
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/149855
专题中国科学院大连化学物理研究所
作者单位1.Liaoning Univ Technol, Coll Sci, Modern Phys Lab, Jinzhou 121001, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
3.Liaoning Univ Technol, Sch Chem & Environm Engn, Lab Mol React Dynam, Jinzhou 121001, Peoples R China
4.Xinjiang Inst Engn, Key Lab Univ Educ, Dept Xinjiang Uygur Autonomous Region New Energy, Urumqi 830091, Peoples R China
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Feng, Li-Qiang,Li, Wen-Liang,Liu, Hang. Electron-Nuclear Dynamics in Molecular Harmonic Generation Driven by a Plasmonic Nonhomogeneous Field[J]. ANNALEN DER PHYSIK,2017,529(8).
APA Feng, Li-Qiang,Li, Wen-Liang,&Liu, Hang.(2017).Electron-Nuclear Dynamics in Molecular Harmonic Generation Driven by a Plasmonic Nonhomogeneous Field.ANNALEN DER PHYSIK,529(8).
MLA Feng, Li-Qiang,et al."Electron-Nuclear Dynamics in Molecular Harmonic Generation Driven by a Plasmonic Nonhomogeneous Field".ANNALEN DER PHYSIK 529.8(2017).
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