Dynamics of molecular alignment steered by a few-cycle terahertz laser pulse

doi:10.1088/1674-1056/ac6eeb

中国物理B ›› 2022, Vol. 31 ›› Issue (10): 103301-103301.doi: 10.1088/1674-1056/ac6eeb

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Dynamics of molecular alignment steered by a few-cycle terahertz laser pulse

Qi-Yuan Cheng(程起元)^1,2,3,4, Yu-Zhi Song(宋玉志)², Deng-Wang Li(李登旺)^2,3, Zhi-Ping Liu(刘治平)⁴, and Qing-Tian Meng(孟庆田)^2,†

1. Medical Engineering Department, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan 250021, China;
2. School of Physics and Electronics, Shandong Normal University, Jinan 250358, China;
3. Shandong Laibo Biotechnology Co., Ltd., Jinan 250101, China;
4. School of Control Science and Engineering, Shandong University, Jinan 250061, China

收稿日期:2022-04-03 修回日期:2022-05-07 出版日期:2022-10-16 发布日期:2022-09-27
通讯作者: Qing-Tian Meng E-mail:qtmeng@sdnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12274265 and 11874241) and the Taishan Scholar Project of Shandong Province, China.

Dynamics of molecular alignment steered by a few-cycle terahertz laser pulse

Qi-Yuan Cheng(程起元)^1,2,3,4, Yu-Zhi Song(宋玉志)², Deng-Wang Li(李登旺)^2,3, Zhi-Ping Liu(刘治平)⁴, and Qing-Tian Meng(孟庆田)^2,†

1. Medical Engineering Department, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan 250021, China;
2. School of Physics and Electronics, Shandong Normal University, Jinan 250358, China;
3. Shandong Laibo Biotechnology Co., Ltd., Jinan 250101, China;
4. School of Control Science and Engineering, Shandong University, Jinan 250061, China

Received:2022-04-03 Revised:2022-05-07 Online:2022-10-16 Published:2022-09-27
Contact: Qing-Tian Meng E-mail:qtmeng@sdnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12274265 and 11874241) and the Taishan Scholar Project of Shandong Province, China.

摘要/Abstract

摘要： The field-free alignment of molecule ClCN is investigated by using a terahertz few-cycle pulse (THz FCP) based on the time-dependent density matrix theory. It is shown that a high degree of molecular alignment can be obtained by changing the matching number of the THz FCPs in the adiabatic regime and the non-adiabatic regime. The matching number can affect both the maximum value of the alignment and the time at which it is achieved. It is also found that a higher degree of alignment can be achieved by using the THz FCP at lower intensity and there exists an optimal threshold of molecular alignment with the increase of the field amplitude. Also found is the frequency sensitive region in which the degree of maximum alignment can be enhanced greatly by modulating the center frequencies of different THz FCPs. The investigation demonstrates that comparing with a THz single-cycle pulse, a better result of the field-free alignment can be created by a THz FCP at a constant rotational temperature of molecule.

关键词: molecular alignment, few-cycle terahertz pulse, density matrix theory

Abstract: The field-free alignment of molecule ClCN is investigated by using a terahertz few-cycle pulse (THz FCP) based on the time-dependent density matrix theory. It is shown that a high degree of molecular alignment can be obtained by changing the matching number of the THz FCPs in the adiabatic regime and the non-adiabatic regime. The matching number can affect both the maximum value of the alignment and the time at which it is achieved. It is also found that a higher degree of alignment can be achieved by using the THz FCP at lower intensity and there exists an optimal threshold of molecular alignment with the increase of the field amplitude. Also found is the frequency sensitive region in which the degree of maximum alignment can be enhanced greatly by modulating the center frequencies of different THz FCPs. The investigation demonstrates that comparing with a THz single-cycle pulse, a better result of the field-free alignment can be created by a THz FCP at a constant rotational temperature of molecule.

Key words: molecular alignment, few-cycle terahertz pulse, density matrix theory

中图分类号: (Photon interactions with molecules)

33.80.-b

33.15.Vb (Correlation times in molecular dynamics) 33.80.Wz (Other multiphoton processes) 33.15.Kr (Electric and magnetic moments (and derivatives), polarizability, and magnetic susceptibility)

Qi-Yuan Cheng(程起元), Yu-Zhi Song(宋玉志), Deng-Wang Li(李登旺), Zhi-Ping Liu(刘治平), and Qing-Tian Meng(孟庆田). Dynamics of molecular alignment steered by a few-cycle terahertz laser pulse[J]. 中国物理B, 2022, 31(10): 103301-103301.

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Dynamics of molecular alignment steered by a few-cycle terahertz laser pulse

Dynamics of molecular alignment steered by a few-cycle terahertz laser pulse

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