Active Negative Index Metamaterial Powered by an Electron Beam

TL;DR

This paper introduces an active negative index metamaterial powered by an electron beam, capable of supporting resonant modes for applications like coherent radiation sources and particle accelerators.

Contribution

It presents a novel metamaterial design that uses an electron beam for gain, enabling negative index behavior at microwave frequencies.

Findings

Supports negative-index transverse magnetic mode

Resonantly interacts with relativistic electron beam

Potential applications in radiation sources and accelerators

Abstract

A novel active negative index metamaterial that derives its gain from an electron beam is intro- duced. The metamaterial consists of a stack of equidistant parallel metal plates perforated by a periodic array of holes shaped as complementary split-ring resonators. It is shown that this structure supports a negative-index transverse magnetic electromagnetic mode that can resonantly interact with a relativistic electron beam. Such metamaterial can be used as a coherent radiation source or a particle accelerator.