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Special Issue:
SPECIAL TOPIC — Ultrafast physics in atomic, molecular and optical systems
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| SPECIAL TOPIC — Ultrafast physics in atomic, molecular and optical systems |
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High-order harmonic generation of methane in an elliptically polarized field |
| Shu-Shan Zhou(周书山)1, Yu-Long Li(李玉龙)2, Zhi-Xue Zhao(赵志学)1, Man Xing(幸满)3, Nan Xu(许楠)1, Hao Wang(王浩)1, Jun Wang(王俊)3, Xi Zhao(赵曦)4, and Mu-Hong Hu(胡木宏)1,† |
1 School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China;
2 Beijing Institute of Space Launch Technology, Beijing 100076, China;
3 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
4 School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China |
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Abstract We performed real-time and real-space numerical simulations of high-order harmonic generation in the three-dimensional structured molecule methane (CH$_{4}$) using time-dependent density functional theory. By irradiating the methane molecule with an elliptically polarized laser pulse polarized in the \( x \)-\( y \) plane, we observed significant even-order harmonic emission in the \( z \)-direction. By analyzing the electron dynamics in the electric field and the multi-orbital effects of the molecule, we revealed that electron recombination near specific atoms in methane is the primary source of high-order harmonic generation in the \( z \)-direction. Furthermore, we identified the dominant molecular orbitals responsible for the enhancement of harmonics in this direction and demonstrated the critical role played by multi-orbital effects in this process.
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Received: 08 March 2025
Revised: 09 April 2025
Accepted manuscript online: 11 April 2025
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PACS:
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12204214), the National Key Research and Development Program of China (Grant No. 2022YFE0134200), the Fundamental Research Funds for the Central Universities (Grant No. GK202207012), QCYRCXM-2022-241, and the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2025A1515011117). |
Corresponding Authors:
Mu-Hong Hu
E-mail: humuhong@163.com
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Cite this article:
Shu-Shan Zhou(周书山), Yu-Long Li(李玉龙), Zhi-Xue Zhao(赵志学), Man Xing(幸满), Nan Xu(许楠), Hao Wang(王浩), Jun Wang(王俊), Xi Zhao(赵曦), and Mu-Hong Hu(胡木宏) High-order harmonic generation of methane in an elliptically polarized field 2025 Chin. Phys. B 34 063202
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