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Femtosecond laser-induced sub-wavelength plasma inside dielectrics: III. Terahertz radiation emission by Ardaneh, Kazem; Nishikawa, Ken-Ichi; Giust, Remo; Morel, Benoit; Charpin, Pierre-Jean; Couairon, Arnaud; Bonnaud, Guy; Courvoisier, Francois is a scholarly article available to read on EtoBox.

What is Femtosecond laser-induced sub-wavelength plasma inside dielectrics: III. Terahertz radiation emission about?

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.

Author

Ardaneh, Kazem; Nishikawa, Ken-Ichi; Giust, Remo; Morel, Benoit; Charpin, Pierre-Jean; Couairon, Arnaud; Bonnaud, Guy; Courvoisier, Francois

Published

2023

Language

EN