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Traveling-wave antenna model for terahertz radiation from laser-plasma interactions

by Jiayu Zhao, Yuchen Hui, Yamin Chen, Zuanming Jin, Alexander P. Shkurinov, Yan Peng, Yiming Zhu and Songlin Zhuang

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Submission summary

Authors (as registered SciPost users): Yuchen Hui · Jiayu Zhao
Submission information
Preprint Link: scipost_202111_00017v2  (pdf)
Date accepted: 2022-07-13
Date submitted: 2022-05-28 06:18
Submitted by: Hui, Yuchen
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
  • Atomic, Molecular and Optical Physics - Experiment
  • Atomic, Molecular and Optical Physics - Theory
Approaches: Theoretical, Experimental


Generation of terahertz (THz) wave from air plasma induced by femtosecond laser pulses with a single central frequency (the so-called “single-color”) is one of the fundamental interactions between light and matter, and is also the basis of subsequent pumping schemes using two- or multi-color laser fields. Recently, more states of media beyond gas (e.g., atomic cluster and liquid) via photo-ionization have brought new experimental observations of THz radiation, which can no longer be simply attributed to the mainstream model of the transition-Cherenkov radiation (TCR), thus making the whole picture unclear. Here, we revisited the mechanism of this dynamic process in a new view of the traveling-wave antenna (TWA) model. By successfully reproducing the reported far-field THz radiation profiles from various plasma filament arrangements, the wide applicability of the TWA theory has been revealed. On the other hand in the microscopic view, we investigated the plasma oscillation during filamentation aiming at further bridging the plasma filament and the antenna. Accordingly, THz-plasma resonance has been theoretically and experimentally demonstrated as the elementary THz emitter, paving the way towards fully understanding this important single-color plasma based THz source.

Author comments upon resubmission

We gratefully appreciate the precious time that the editor has spent on our manuscript, and also the constructive comments from the reviewers, which are significant to promote the quality of our research.

List of changes

1-“universal” has been removed or replaced all over the revised manuscript.
2-The reasons for neglecting the water film absorption of THz waves have been addressed (in blue) in the third paragraph of Section 2.8 of the main text.
3-The choice of plasma frequency dependent on our experimental situation is explained (in blue) in the paragraph before Section 3.2 of the main text.
4-Discussions about the influence of the external electrical field on the THz yield are addressed (in blue) in the last paragraph of Section B in the Supporting Materials.
5-We have emphasized on the bridging effect of Supplemental Materials A-C in the first paragraph of Section 3.1 of the main text (in blue) in order to strength the connection between Section 2 and 3.
6-Discussions about the plasma-THz resonance phenomenon have been added in the paragraph before Section 3.2 of the main text, and also in the revised Supplemental Materials as Section F.

Published as SciPost Phys. Core 5, 046 (2022)

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Anonymous on 2022-06-15  [id 2580]

My recommendation is acceptance of the manuscript in its current version.

Anonymous on 2022-06-05  [id 2557]

I am satisfied with the revised work, and I can recommend publication of this work in Scipost Physics.