Terahertz surface plasmon excitation over a bismuth thin film by an electron beam

• A bismuth thin film grown over a glass substrate supports surface plasma waves in terahertz frequency range.
• The SPW phase velocity is sensitive to the thickness of bismuth film and it is driven via the Cerenkov resonance.
• An electron beam propagating at close proximity to the bismuth layer can excite surface plasma wave in terahertz range.
• The growth rate for terahertz radiation generation by an electron beam is obtained.
• The desired THz frequency can be excited by varying the Bi film thickness.

The excitation of terahertz surface plasma wave (SPW) over bismuth thin film-glass structure by a parallel propagating electron beam is studied. The SPW phase velocity is sensitive to the thickness of bismuth film and it is driven via the Cerenkov resonance. The growth rate for terahertz radiation generation by an electron beam is obtained under small signal approximation.

The excitation of terahertz surface plasma wave (SPW) over bismuth thin film-glass structure by a parallel propagating electron beam is studied. The SPW phase velocity is sensitive to the thickness of bismuth film and it is driven via the Cerenkov resonance. The growth rate for terahertz radiation generation by an electron beam is obtained.Figure optionsDownload as PowerPoint slide