Wake excitation of volume and surface polaritons by a relativistic electron bunch in an ion dielectric

TL;DR

This paper investigates how a relativistic electron bunch excites wakefields, including volume and surface polaritons, in an ion dielectric waveguide, revealing complex electromagnetic phenomena relevant for advanced waveguide applications.

Contribution

It introduces the analysis of wakefield excitation of both volume and surface polaritons in ion dielectric media by relativistic electron bunches, highlighting new electromagnetic wave interactions.

Findings

Wakefields include longitudinal polaritons and Cherenkov radiation.

Surface polaritons are excited in waveguides with axial vacuum channels.

Electromagnetic eigen waves are characterized in the dielectric waveguide.

Abstract

The process of wake fields excitation by a relativistic electron bunch in ion dielectric media is considered. The space-time structure of the excited wakefield in an ion dielectric waveguide is investigated. It is shown that the wake field in the infrared (terahertz) ranges consists of the field of longitudinal polaritons and Cherenkov radiation, which is a set of electromagnetic eigen waves (transverse polaritons) of a dielectric waveguide. A branch of surface polaritons appears in a dielectric waveguide with an axial vacuum channel. The process of wakefield excitation of surface polaritons by a relativistic electron bunch is also considered.