Yong-Qiang Liu, Liangsheng Li, Hongcheng Yin
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10848/1084806/Spoof-surface-plasmons-on-the-corrugated-metal-surface-with-gradient/10.1117/12.2504127.short?SSO=1
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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