Cherenkov Radiation Based on Effective Surface Plasmon Polaritons

Cherenkov radiation based on effective surface plasmon polaritons is introduced in this work. The effective surface plasmon polaritons excited by a moving electron bunch in a parallel plate waveguide can be transformed into Cherenkov radiation. The operating frequency can be tuned by adjusting the relative permittivity of the filling medium and the geometry parameters. Moreover, this system has strong robustness. This mechanism defies the limitations of materials and can be achieved at arbitrary frequency ranges by tuning corresponding parameters. This work offers a platform for the study of Cherenkov radiation in waveguide structures and promotes related applications.