Traveling-wave antenna model for terahertz radiation from laser-plasma interactions
Jiayu ZhaoQining WangYuchen HuiYamin ChenFeifan ZhuZuanming JinA. P. ShkurinovYan PengYiming ZhuSonglin ZhuangLi Lao
8
Citation
84
Reference
10
Related Paper
Citation Trend
Abstract:
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.Keywords:
Filamentation
Transition radiation
Photomixing
Filamentation
Cite
Citations (2)
This paper reviews the recent studies of filamentation of femtosecond lasers pulses in air in the Institute of Physics, Chinese Academy of Sciences. The filamentation mechanisms of free propagated femtosecond laser pulses, effect of air turbulence on the filamentation, interaction between filaments are presented.
Filamentation
Cite
Citations (7)
Transition radiation
Cite
Citations (0)
Transition radiation
Cherenkov detector
Particle detector
Particle identification
Particle radiation
Particle (ecology)
Cite
Citations (0)
A simple model of multiple filamentation of single femtosecond laser pulses in LiF was obtained on the basis of a nonlinear Schrödinger equation. The results of a computer simulation were compared with experimentally observed fluorescent traces of filaments in LiF.
Filamentation
Cite
Citations (15)
The filamentation of femtosecond pulses has attracted significant attention, owing to its unique characteristics and related applications. The self-focusing critical power of femtosecond pulses is one of the key parameters in the filamentation process and its application. However, the experimental determination of this power remains a challenging task. In this study, we propose an experimental approach to investigating the critical power for self-focusing of both femtosecond Gaussian and vortex beams with relatively low topological charges by analyzing the changes in the focal spot at different propagation distances. Our work offers a practical and convenient method for determining the self-focusing critical power of femtosecond pulses.
Filamentation
Self-focusing
Cite
Citations (2)
Filamentation
Cite
Citations (1)
The influence to filamentation of femtosecond by atmospheric turbulence at wavelength of 400 nm has been studied numerically. Simulations show that the distance of filamentation at 400 nm is advanced, the number of filaments increases, and the energy of filaments decreases with the addition of turbulent screen. Compared with the filaments formed by the 800 nm femtosecond laser, the nonlinear propagation of 400 nm laser has a longer filamentation distance in the turbulent atmosphere, and the clamping light intensity of the filaments is higher, but the number of filaments has reduced. With the increase of propagation distance, the multifilament structure disappears and the beam gradually converges into a stable monofilament structure. The position of the monofilament structure at 400 nm is closer than the 800 nm. Therefore, stable filament structure can be obtained more easily with a femtosecond laser at 400 nm.
Filamentation
Cite
Citations (0)
Filamentation
Cite
Citations (1)
We analyze the radiation from a charged particle crossing the boundary between an ordinary medium and a "left-handed" metamaterial. We obtain exact and approximate expressions for the field components and develop algorithms for their computation. The spatial radiation in this system can be separated into three distinct components, corresponding to ordinary transition radiation having a relatively large magnitude, Cherenkov radiation, and reversed Cherenkov-transition radiation (RCTR). The last one is explained by reflection and refraction of reversed Cherenkov radiation at the interface. Conditions for generating of RCTR are obtained. We note properties of this radiation that have potential applications in the detection of charged particles and accelerator beams and for the characterization of metamaterial macroscopic parameters (epsilon, mu).
Transition radiation
Cite
Citations (72)