Wavelength Scaling of Terahertz Wave Absorption via Preformed Air Plasma

Zhao, Jinhua; Zhang, Liangliang; Wu, Tong; Zhang, Cunlin; Zhao, Yuejin

doi:10.1109/tthz.2016.2607022

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…The temporal characteristics and corresponding mechanism in the gas phase have been widely investigated. 35,36 The results of nitrogen gas in our experiment are consistent with previous studies. The experimental evidence in Fig.…”

Section: Experimental Results and Analysissupporting

confidence: 92%

Transient evolution of quasifree electrons of plasma in liquid water revealed by optical-pump terahertz-probe spectroscopy

et al. 2021

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The fundamental properties of laser-induced plasma in liquid water, such as the ultrafast electron migration and solvation, have not yet been clarified. We use 1650-nm femtosecond laser pulses to induce the plasma in a stable free-flowing water film under the strong field ionization mechanism. Moreover, we adopt intense terahertz (THz) pulses to probe the ultrafast temporal evolution of quasifree electrons of the laserinduced plasma in water on the subpicosecond scale. For the first time, the THz wave absorption signal with a unique two-step decay characteristic in time domain is demonstrated, indicating the significance of electron solvation in water. We employ the Drude model combined with the multilevel intermediate model and particlein-a-box model to simulate and analyze the key information of quasifree electrons, such as the frequencydomain absorption characteristics and solvation ratio. In particular, we observe that the solvation capacity of liquid water decreases with the increase of pumping energy. Up to ∼50% of quasifree electrons cannot be captured by traps associated with the bound states as the pumping energy increases to 90 μJ∕pulse. The ultrafast electron evolution in liquid water revealed by the optical-pump/THz-probe experiment provides further insights into the formation and evolution mechanisms of liquid plasma.

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Section: Experimental Results and Analysissupporting

confidence: 92%

Transient evolution of quasifree electrons of plasma in liquid water revealed by optical-pump terahertz-probe spectroscopy

et al. 2021

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“…Wang and Cao discussed the propagation properties of THz waves through a dusty plasma slab, respectively [35,36]. Zhao investigated the THz wave absorption by a preformed plasma created by a laser pulse [37]. Jiang employed the terahertz time-domain spectroscopy to characterize the electron density of inductively-coupled argon plasmas [38].…”

Section: Introductionmentioning

confidence: 99%

The simulation of terahertz waves transmission in the arc plasma

et al. 2023

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The diagnostic of high-density hot plasma is a challenging task due to its high temperature and electron density. Arc plasma is one of the typical hot density plasmas, and its diagnosis is the key to develop its new applications. In this paper, the temperature and density distributions of welding plasmas with different discharge currents are numerically simulated based on a Tungsten Inert Gas Arc Welding model, and the electron density distributions are calculated. Then propagation properties of broadband terahertz (THz) waves in the modeling arc jets are calculated by the finite difference time domain method. These results not only provide a preliminary theoretical guidance for in-depth understanding the problems of blackout in re-entry communication, but also develop a new idea for the terahertz diagnostic of plasma with high density.

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Transmission characteristics of terahertz waves propagation in magnetized plasma using the WKB method

Zheng

2019

Optik

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Wavelength Scaling of Terahertz Wave Absorption via Preformed Air Plasma

Cited by 5 publications

References 14 publications

Transient evolution of quasifree electrons of plasma in liquid water revealed by optical-pump terahertz-probe spectroscopy

Transient evolution of quasifree electrons of plasma in liquid water revealed by optical-pump terahertz-probe spectroscopy

The simulation of terahertz waves transmission in the arc plasma

Transmission characteristics of terahertz waves propagation in magnetized plasma using the WKB method

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