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Article Dans Une Revue Physics of Plasmas Année : 2023

Femtosecond laser-induced sub-wavelength plasma inside dielectrics. III. Terahertz radiation emission

Résumé

Electromagnetic radiation within the terahertz (THz) frequency range is of great interest for applications in remote sensing and time-domain spectroscopy. The laser-induced plasmas are promising mediums for generating THz radiation. It has been recently reported that focusing femtosecond Bessel pulses inside dielectrics induces a high aspect ratio over-critical plasmas. Here, we show that the intense resonantly driven electrostatic fields at the so-called critical surface lead to THz radiation emission. Through three-dimensional particle-in-cell simulation and analytical derivation, we have investigated the emission of THz radiation. We show that the THz radiation is associated with a hot population of electrons trapped in ambipolar electric fields of the double layers.
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hal-03940402 , version 1 (16-01-2023)

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Kazem Ardaneh, Ken-Ichi Nishikawa, Remo Giust, Benoit Morel, Pierre-Jean Charpin, et al.. Femtosecond laser-induced sub-wavelength plasma inside dielectrics. III. Terahertz radiation emission. Physics of Plasmas, 2023, 30 (1), pp.013301. ⟨10.1063/5.0126427⟩. ⟨hal-03940402⟩
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