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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
This Submission thread is now published as
|Authors (as registered SciPost users):
|Yuchen Hui · Jiayu Zhao
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.
Published as SciPost Phys. Core 5, 046 (2022)
Author comments upon resubmission
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.
Submission & Refereeing History
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- Report 2 submitted on 2022-04-21 16:49 by Anonymous
- Author Reply by Mr Hui on 2022-04-24
- Report 1 submitted on 2022-04-19 11:48 by Anonymous