Coherent terahertz emission from a plasma layer due to linear conversion of laser wakefields on pre-modulated ion density

Результат исследования: Научные публикации в периодических изданияхстатья

3 Цитирования (Scopus)

Аннотация

In this paper, electromagnetic emission at the plasma frequency produced by a short laser pulse in a finite-size plasma layer with a longitudinal density modulation is studied using both analytical theory and particle-in-cell simulations. The radiation mechanism suggests that a laser pulse excites a long-lived plasma wake which, in the presence of ion density modulation with the appropriate period, generates a superluminal satellite capable of matching in phase with vacuum electromagnetic waves. It is found that such a mechanism can be used for generating tunable narrow-band (5%) multi-mJ terahertz pulses with high efficiency (>0.3%) due to ability of superluminal plasma oscillations at the cut-off frequency to diffuse through a plasma that is several times wider than the radiation wavelength.

Язык оригиналаанглийский
Номер статьи125006
Число страниц7
ЖурналPlasma Physics and Controlled Fusion
Том61
Номер выпуска12
DOI
СостояниеОпубликовано - 28 окт 2019

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