中国物理B ›› 2022, Vol. 31 ›› Issue (5): 56103-056103.doi: 10.1088/1674-1056/ac422d

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How to realize an ultrafast electron diffraction experiment with a terahertz pump: A theoretical study

Dan Wang(王丹)1,2, Xuan Wang(王瑄)1,3,†, Guoqian Liao(廖国前)1, Zhe Zhang(张喆)1,3,4, and Yutong Li(李玉同)1,2,3   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Songshan Lake Materials Laboratory, Dongguan 523808, China;
    4 Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
  • 收稿日期:2021-10-13 修回日期:2021-12-06 发布日期:2022-04-29
  • 通讯作者: Xuan Wang,E-mail:xw@iphy.ac.cn E-mail:xw@iphy.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.11774409,11827807,and 92050106).This work is supported by the Synergic Extreme Condition User Facility.

How to realize an ultrafast electron diffraction experiment with a terahertz pump: A theoretical study

Dan Wang(王丹)1,2, Xuan Wang(王瑄)1,3,†, Guoqian Liao(廖国前)1, Zhe Zhang(张喆)1,3,4, and Yutong Li(李玉同)1,2,3   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Songshan Lake Materials Laboratory, Dongguan 523808, China;
    4 Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2021-10-13 Revised:2021-12-06 Published:2022-04-29
  • Contact: Xuan Wang,E-mail:xw@iphy.ac.cn E-mail:xw@iphy.ac.cn
  • About author:2021-12-11
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.11774409,11827807,and 92050106).This work is supported by the Synergic Extreme Condition User Facility.

摘要: To integrate a terahertz pump into an ultrafast electron diffraction (UED) experiment has attracted much attention due to its potential to initiate and detect the structural dynamics both directly. However, the deflection of the electron probe by the electromagnetic field of the terahertz pump alters the incident angle of the electron probe on the sample, impeding it from recording structural information afterwards. In this article, we studied this issue by a theoretical simulation of the terahertz-induced deflection effect on the electron probe, and came up with several possible schemes to reduce such effect. As a result, a terahertz-pump-electron-probe UED experiment with a temporal resolution comparable to the terahertz period is realized. We also found that MeV UED was more suitable for such terahertz pump experiment.

关键词: terahertz pump, ultrafast electron diffraction, terahertz-electron interaction

Abstract: To integrate a terahertz pump into an ultrafast electron diffraction (UED) experiment has attracted much attention due to its potential to initiate and detect the structural dynamics both directly. However, the deflection of the electron probe by the electromagnetic field of the terahertz pump alters the incident angle of the electron probe on the sample, impeding it from recording structural information afterwards. In this article, we studied this issue by a theoretical simulation of the terahertz-induced deflection effect on the electron probe, and came up with several possible schemes to reduce such effect. As a result, a terahertz-pump-electron-probe UED experiment with a temporal resolution comparable to the terahertz period is realized. We also found that MeV UED was more suitable for such terahertz pump experiment.

Key words: terahertz pump, ultrafast electron diffraction, terahertz-electron interaction

中图分类号:  (Electron diffraction and scattering)

  • 61.05.J-
63.90.+t (Other topics in lattice dynamics) 41.90.+e (Other topics in electromagnetism; electron and ion optics) 06.60.Jn (High-speed techniques)