Long-lived field-free molecular orientation driven by modulated few-cycle terahertz pulses

Yu, Jie; Liu, Yong; Su, Qian-Zhen; Cong, Shu‐Lin

doi:10.1016/j.chemphys.2012.06.011

Cited by 10 publications

(3 citation statements)

References 44 publications

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“…Kitano et al [577] proposed to apply an intense fs pulse creating a rotational wave packet and then a delayed THz pulse that resonantly couples opposite parity states resulting in field-free orientation. Yu et al [578] proposed to use two modulated few-cycle THz pulses to achieve long lived post-pulse molecular orientation.…”

Section: Interaction With Short Laser Pulses: Nonadiabatic Alignment ...mentioning

confidence: 99%

Manipulation of molecules with electromagnetic fields

et al. 2013

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I. INTRODUCTIONThe past few decades have witnessed remarkable developments of laser techniques setting the stage for new areas of research in molecular physics. It is now possible to interrogate molecules in the ultrafast and ultracold regimes of molecular dynamics and the measurements of molecular structure and dynamics can be made with unprecedented precision. Molecules are inherently complex quantum-mechanical systems. The complexity of molecular structure, if harnessed, can be exploited for yet another step forward in science, potentially leading to technology for quantum computing, quantum simulation, precise field sensors, and new lasers.The goal of the present article is to review the major developments that have led to the current understanding of molecule -field interactions and experimental methods for manipulating molecules with electromagnetic fields. Molecule -field interactions are at the core of several, seemingly distinct, areas of molecular physics. This is reflected in the organization of this article, which includes sections on Field control of molecular beams, External field traps for cold molecules, Control of molecular orientation and molecular alignment, Manipulation of molecules by nonconservative forces, Ultracold molecules and ultracold chemistry, Controlled many-body phenomena, Entanglement of molecules and dipole arrays, and Stability of molecular systems in high-frequency super-intense laser fields. By combining these topics in the same review, we would like to emphasize that all this work is based on the same basic Hamiltonian.This review is also intended to serve as an introduction to the excellent collection of articles appearing in this same-titled volume of Molecular Physics [1-27]. These original contributions demonstrate the latest developments exploiting control of molecules with electromagnetic fields. The reader will be treated to a colourful selection of articles on topics as diverse as Chemistry in laser fields, Quantum dynamics in helium droplets, Effects of microwave and laser fields on molecular motion, Rydberg molecules, Molecular structure in external fields, Quantum simulation with ultracold molecules, and Controlled molecular interactions, written by many of the leading protagonists of these fields.This article is concerned chiefly with the effects of electromagnetic fields on low-energy rotational, fine-structure and translational degrees of freedom. There are several important research areas that are left outside the scope of this paper, most notably the large body of work on the interaction of molecules with attosecond laser pulses and high harmonic generation [28], coherent control of molecular dynamics [29] and optimal control of molecular processes [30]. We limit the discussion of resonant interaction of light with molecules to laser cooling strategies. We do not survey spectroscopy or transfer of population between molecular states. Even with these restrictions, this is a vast area to review, as is apparent from the number of references. We did our best to in...

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Section: Interaction With Short Laser Pulses: Nonadiabatic Alignment ...mentioning

confidence: 99%

Manipulation of molecules with electromagnetic fields

et al. 2013

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“…Efficient and long-lived field-free orientation of molecules was realized by a single hybrid short pulse [40]. Long-lived fieldfree molecular orientation could be prepared by modulated few-cycle THz pulses [41]. Field-free molecular orientation induced by a single-color or dual-color pulses can be manipulated by adjusting the pulse linear chirp [42].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of molecular orientation with two super-Gaussian pulses

Wu¹,

Chai²,

Ni³

et al. 2020

Laser Phys. Lett.

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A theoretical scheme is presented to realize effective molecular orientation driven by two super-Gaussian pulses (SGPs). As an applied example, the orientation dynamics of LiH molecule is studied by using the time-dependent quantum wave packet method. The calculations are performed including both the molecular vibrational and rotational degrees of freedom. It is shown that the efficient molecular orientation can be achieved by two SGPs, and the maximal orientation degree is 0.823, which is obviously better than those by the Gaussian pulse and a single SGP. The orientation degree and orientation duration time are dependent on the laser frequency, field intensity and delay time between two SGPs. The pulse shaped parameter N characterizing the SGP has effects on molecular orientation and rotational population. Furthermore, the molecular orientation degree and orientation duration time decrease with the increase of temperature. A long-lived molecular orientation duration time and high orientation degree can be achieved in the range of temperature from 0 to 100 K.

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“…Thus, several studies are also devoted to extending the orientation duration. Daems et al [47] and Yu et al [48] obtained an efficient and long-lived orientation of the molecule. In a recent study, the enantioselective orientation of chiral molecules was achieved by terahertz pulses with twisted polarization, and the orientation persists for a long time [49].…”

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Controlling molecular orientation by laser pulses with two different envelope shapes

Guo

Zhou

Chai

et al. 2021

Int J of Quantum Chemistry

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We use density matrix theory to numerically simulate the orientation of LiH molecules induced by laser pulses with two different envelope shapes. The results show that the envelope shape of the terahertz single-cycle laser pulse (SCP) has significant effects on molecular orientation degree and duration. When a SCP with adjusted laser field amplitude and carrier envelope phase is used to steer the molecular orientation, a larger orientation degree can be obtained by the Gaussian-shaped SCP, while a longer orientation duration can be realized by the sin 2 -shaped SCP.When combined with the two-color femtosecond laser pulse, the sin 2 -shaped SCP is better than Gaussian-shaped SCP, either in improving orientation degree and duration or in stability and controllability shown with increasing temperature. The optimal molecular orientation can be realized under the combination of the two-color femtosecond laser pulse and sin 2 -shaped SCP which has the appropriate delay time: the maximal orientation degree reaches 0.801 at 0 K and 0.450 at 20 K, the maximal orientation duration is 31.3% of the rotational period at 0 K.

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Long-lived field-free molecular orientation driven by modulated few-cycle terahertz pulses

Cited by 10 publications

References 44 publications

Manipulation of molecules with electromagnetic fields

Manipulation of molecules with electromagnetic fields

Enhancement of molecular orientation with two super-Gaussian pulses

Controlling molecular orientation by laser pulses with two different envelope shapes

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