An atmospheric plasma jet was generated by ionizing nitrogen ejected from a torch loaded with high voltage. The acquisition of transmission spectra by terahertz time-domain spectroscopy was carried out at three locations at different distances from the plasma torch nozzle. Combined with the theoretical model of terahertz pulse propagation in uniform plasma medium, the average density of plasma was calculated from the phase shift and spectral amplitude ratio measured experimentally. By comparing the measurement results of plasma density with those of Langmuir double-probe for these three different positions, the feasibility of measuring average density of atmospheric plasma with terahertz time-domain spectroscopy was corroborated.
Spoof surface plasmons (SSP) on the corrugated metal surfaces has attracted intense research interests and can find many interesting applications such as wave guiding, imaging, sensing, etc in microwave and terahertz (THz) band. Previous studies show that the intense near-field of SSP mode on the metallic grating can be used to develop a new enhanced radiation source which is induced by injected electron beam. In this paper, we study SSP mode on a modified metallic grating, i.e. the inverse L-shaped sub-wavelength metallic grooves. The general dispersion relation is obtained with a modal expansion method by solving field expressions in different regions along with proper boundary conditions. The theoretical result is also verified by finite integration method and good agreement is observed. Based on the dispersion result, a terahertz radiation source on the inverse L-shaped metallic grooves is proposed and studied by FDTD simulation. The results reveal that SSP mode can be efficiently excited by injected electron beam when the dispersion is matched well with each other. Also, the output power revolution of SSP mode and electron beam energy change are presented in the structure. The presented studies are instructive to design more efficient THz electronic sources based on the generation of SSP on the corrugated metal surface with gradient groove depth.
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