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题名: Electron-Nuclear Dynamics in Molecular Harmonic Generation Driven by a Plasmonic Nonhomogeneous Field
作者: 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
发表日期: 2017-08-01
DOI: 10.1002/andp.201700093
卷: 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
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.
关键词[WOS]: INTENSE LASER FIELDS ;  NONLINEAR OPTICS ;  ATTOSECOND PULSE ;  ENHANCEMENT ;  IONIZATION ;  EMISSION ;  H-2(+)
语种: 英语
WOS记录号: WOS:000409204100017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/149855
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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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

Recommended Citation:
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).
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