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Field-Free Molecular Orientation Induced by a Single-Cycle THz Laser Pulse Train

Published online by Cambridge University Press:  31 August 2016

Xiao-Miao Zhang ,
Jian Li ,
Jie Yu  and
Shu-Lin Cong
Xiao-Miao Zhang*
Affiliation:
School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
Jian Li*
Affiliation:
School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
Jie Yu*
Affiliation:
School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
Shu-Lin Cong*
Affiliation:
School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
*
*Corresponding author. Email addresses:xiaomiaozhang@mail.dlut.edu.cn (X.-M. Zhang), dlut_lijian@mail.dlut.edu.cn (J. Li), yujie@dlut.edu.cn (J. Yu), shlcong@dlut.edu.cn (S.-L. Cong)
*Corresponding author. Email addresses:xiaomiaozhang@mail.dlut.edu.cn (X.-M. Zhang), dlut_lijian@mail.dlut.edu.cn (J. Li), yujie@dlut.edu.cn (J. Yu), shlcong@dlut.edu.cn (S.-L. Cong)
*Corresponding author. Email addresses:xiaomiaozhang@mail.dlut.edu.cn (X.-M. Zhang), dlut_lijian@mail.dlut.edu.cn (J. Li), yujie@dlut.edu.cn (J. Yu), shlcong@dlut.edu.cn (S.-L. Cong)
*Corresponding author. Email addresses:xiaomiaozhang@mail.dlut.edu.cn (X.-M. Zhang), dlut_lijian@mail.dlut.edu.cn (J. Li), yujie@dlut.edu.cn (J. Yu), shlcong@dlut.edu.cn (S.-L. Cong)
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Abstract

We investigate theoretically the field-free orientation of CO molecules induced by a single-cycle THz laser pulse train. It is shown that the molecular orientation can be obviously enhanced by applying the pulse train. The laser intensity and pulse number have some effects on the molecular orientation. The high degree of field-free molecular orientation |⟨cosθ⟩|max=0.9246 is obtained at temperature T=0 K. The variations of the maximum orientation degree with the experimentally available pulse number and peak intensity are given. Temperature T has a considerable influence on the field-free molecular orientation. The maximal field-free molecular orientation at T=0, 10, 20 and 30 K for N=14 and E0=1.8 MV/cm are |⟨cosθ⟩|max=0.9188, 0.7338, 0.6055 and 0.5154 in order, and the corresponding effective duration times of molecular orientation are Δt=0.759, 0.432, 0.297 and 0.117 ps.

Keywords

Single-cycle THz laser pulse trainpulse numbermolecular orientation
Type
Research Article
Information
Communications in Computational Physics , Volume 20 , Issue 3 , September 2016 , pp. 689 - 702
Copyright
Copyright © Global-Science Press 2016 

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