Francois Vidal | Searcharxiv

arXiv2014

Skirting Terahertz Waves in a Photo-excited Nanoslit Structure

Terahertz fields can be dramatically enhanced as they propagate through nanometer-sized slits. The enhancement is mediated by significant accumulation of the induced surface charges on the surrounding metal. This enhancement is shown here to be dynamically modulated and the nanoslits are gradually shunted using a copropagating optical beam. The terahertz fields are found to skirt the nanoscale photo-excited region underneath the slits, scattering to the far field and rigorously mapping the near field.

physics.optics↗

arXiv2004

Modeling of a chlorine high-density plasma submitted to a static magnetic field

This paper extends the results of a recently developed one-dimensional model aiming to describe the characteristics of a magnetized chlorine high-density plasma. In this work, the dependence of the plasma characteristics on the magnetic field intensity is investigated. It is shown that the dissociation degree and the relative weight of the various charged species is strongly influenced by the magnetic field when the gas pressure is low enough. In contrast, at higher pressure, the plasma is essentially composed of negative ions, and molecular neutrals and ions, independently of the field intensity. It is further demonstrated that diffusion needs to be considered in order to correctly predict the plasma behavior.

physics.plasm-ph↗