Two-color attosecond chronoscope

Wu, Jianan; Che, Jiayin; B., Zhang, F.; Chen, Chao; Li, Weiyan; Xin, Guoguo; Chen, Yanjun

doi:10.1364/oe.494098

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…图 4 应用响应时间理论得到阿秒钟椭偏依赖的标度律关系 [46] . 实线是TRCM理论模型的结果, 空心符号分别是TDSE和实验 [47] 的结果 (a), (b) 动量分布最亮点(最可几轨道)对应沿着激光偏振主轴方向和副轴方向的动量比较; (c) 动量分布偏转角结果的比较 px py Fig. 4.…”

Section: 其次 Trcm理论模型可以用来得到阿秒钟unclassified

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Advances in response time of strong-field ionization of atoms

Che,

Chen,

et al. 2023

Acta Phys. Sin.

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The response time of the electron to light in photoemission is difficult to define and measure. The tunneling ionization of atoms and molecules in a strong laser field is a kind of strong field-induced photoelectric effect. In this process, the electron response time will change the time of high-order harmonic generation (HHG), which will have a fundamental influence on the reconstruction of electron attosecond dynamics using HHG. We propose a simple theory to resolve the response time problem in strong field atomic tunneling ionization. The response time corresponds to the Coulomb, electron and laser field three body strong interaction time, which can be determined at the quantum classical boundary. The observable directly obtained through response time can quantitatively reproduce a series of attoclock experimental curves and provide consistent explanations for these experimental phenomena. This article introduces the main conclusions of response time theory and provides a detailed discussion on the research progress of this theory. Firstly, this theory can be applied to the orthogonal two-color laser field to quantitatively explain the main characteristic structures of photoelectron momentum distribution (PMD). Besides, with this response time theory, the scaling law of the observable in attoclock experiment can be obtained. The proposal of scaling law is expected to provide a systematical theoretical guide to better understanding the applicability or feasibility of the attoclock under different conditions. In addition, based on the atomic response time theory, we further considered the property of multi-center Coulomb potential of molecular and developed a response time theory suitable for molecular system. Subsequently, we further applied the response time theory to polar molecules, utilizing the asymmetry of PMD closely related to response time to distinguish the permanent dipole (PD) effect within the laser sub-cycle. In the end, we discussed the prospects for research on response time. Firstly, it is envisioned to further apply response time theory to weak light and single photon transition to detect the response time of related processes. Besides, considering the significant influence of response time on the property of time-domain of HHG electron trajectories, it can be attempted to further consider the recombination (re-scattering) effect on the basis of the current strong field tunneling ionization response time theory, in order to extend this theory to describe HHG and above threshold ionization (ATI) processes. Furthermore, designing the “re-scattering electron trajectories” reconstruction scheme based on the electron trajectories with response time correction will provide important suggestions for HHG spectroscopy experiments. Finally, considering the asymmetric ionization caused by the PD effect of polar molecules, if the net ionization yield of adjacent sub-cycles is used as the current indicator, polar molecules can be used as a “micro diode” to study a kind of attosecond response switching devices. Polar molecular diodes emit electrons through tunneling ionization in laser field. According to response time theory, tunneling occurs almost instantaneously, and response time needs to be considered only at the tunneling exit. Based on this, by searching for suitable materials (such as two-dimensional materials), it is possible to design a kind of semi-classical diodes (which can cleverly utilize tunneling) with femtosecond or even sub-femtosecond response time. The response time theory can provide a convenience theoretical tool for the design of such tunneling diodes.

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Section: 其次 Trcm理论模型可以用来得到阿秒钟unclassified

“…The solid line is the result of the TRCM, while the hollow symbol are the results of TDSE and experimental [47] , respectively: 3.8T10 -7…”

Section: 其次 Trcm理论模型可以用来得到阿秒钟mentioning

confidence: 99%

Advances in response time of strong-field ionization of atoms

Che,

Chen,

et al. 2023

Acta Phys. Sin.

Self Cite

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Response time of an electron inside a molecule to light in strong-field ionization

Peng,

Che,

Zhang

et al. 2024

Opt. Express

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We study ionization of aligned H2+ in strong elliptically polarized laser fields numerically and analytically. The calculated offset angle in photoelectron momentum distribution is several degrees larger for the molecule than a model atom with similar ionization potential at diverse laser parameters. Using a strong-field model that considers the properties of multi-center and single-center Coulomb potentials, we are able to quantitatively reproduce this angle difference between the molecule and the atom. Further analyses based on this model show that the response time of electron to light which is encoded in the offset angle and is manifested as the time spent in tunneling ionization, is about 15 attoseconds longer for the molecule than the atom. This time difference is further enlarged when increasing the internuclear distance of the molecule.

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