Electron Beam Instability in Left-Handed Media

Details Electron Beam Instability in Left-Handed Media Electron Beam Instability in Left-Handed Media

2008-04-08

arxiv.org/abs/0804.1168v1

Phys. Rev. Lett. 100, 244803 (2008).

Physics

Classical Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.244803

We predict that two electron beams can develop an instability when passing through a slab of left-handed media (LHM). This instability, which is inherent only for LHM, originates from the backward Cherenkov radiation and results in a self-modulation of the beams and radiation of electromagnetic waves. These waves leave the sample via the rear surface of the slab (the beam injection plane) and form two shifted bright circles centered at the beams. A simulated spectrum of radiation has well-separated lines on top of a broad continuous spectrum, which indicates dynamical chaos in the system. The radiation intensity and its spectrum can be controlled either by the beams' current or by the distance between the two beams.

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