Strong-field terahertz (THz) light-matter interaction provides various nonlinear control approaches in condensed matter physics, energy and material sciences, electron acceleration, and manipulation. Recently developed spintronic THz emission with minimum complexities has been demonstrated to have the capability for generating high field strengths. Up to now, nonlinear applications based on the spintronic THz transients have yet been realized. Here, we report THz emission from two-color femtosecond laser plasma filaments modulated by a 60-kV/cm THz pulse from W/CoFeB/Pt heterostructures. Enhanced THz radiation based on electron acceleration in plasma is recorded when the direction of the spintronic THz modulating field is in line with that of the electron movement. This behavior is quantitatively reproduced by a local current model of the plasma THz source. Our experimental and theoretical results may inspire further nonlinear THz investigation and accelerate ultrafast THz engineering in matter.
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25 April 2022
Research Article|
April 27 2022
Modulated terahertz generation in femtosecond laser plasma filaments by high-field spintronic terahertz pulses
Special Collection:
Ultrafast and Terahertz Spintronics
Shaojie Liu;
Shaojie Liu
1
School of Cyber Science and Technology, Beihang University
, Beijing 100191, China
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Chenhui Lu
;
Chenhui Lu
2
School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science
, Shanghai 201620, China
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Zhengquan Fan;
Zhengquan Fan
3
Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology
, Shanghai 200093, China
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Shixiang Wang;
Shixiang Wang
3
Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology
, Shanghai 200093, China
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Peiyan Li;
Peiyan Li
4
School of Electronic and Information Engineering, Beihang University
, Beijing 100191, China
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Xinhou Chen;
Xinhou Chen
4
School of Electronic and Information Engineering, Beihang University
, Beijing 100191, China
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Jun Pan
;
Jun Pan
4
School of Electronic and Information Engineering, Beihang University
, Beijing 100191, China
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Yong Xu;
Yong Xu
5
Hefei Innovation Research Institute, Beihang University
, Hefei 230012, China
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Yi Liu;
Yi Liu
a)
3
Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology
, Shanghai 200093, China
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Xiaojun Wu
Xiaojun Wu
a)
1
School of Cyber Science and Technology, Beihang University
, Beijing 100191, China
4
School of Electronic and Information Engineering, Beihang University
, Beijing 100191, China
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Note: This paper is part of the APL Special Collection on Ultrafast and Terahertz Spintronics.
Appl. Phys. Lett. 120, 172404 (2022)
Article history
Received:
November 30 2021
Accepted:
April 07 2022
Citation
Shaojie Liu, Chenhui Lu, Zhengquan Fan, Shixiang Wang, Peiyan Li, Xinhou Chen, Jun Pan, Yong Xu, Yi Liu, Xiaojun Wu; Modulated terahertz generation in femtosecond laser plasma filaments by high-field spintronic terahertz pulses. Appl. Phys. Lett. 25 April 2022; 120 (17): 172404. https://doi.org/10.1063/5.0080234
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