Increased impedance near cut-off in plasma-like media leading to emission of high-power, narrow-bandwidth radiation.

ABSTRACT: Ultra-intense, narrow-bandwidth, electromagnetic pulses have become important tools for exploring the characteristics of matter. Modern tuneable high-power light sources, such as free-electron lasers and vacuum tubes, rely on bunching of relativistic or near-relativistic electrons in vacuum. Here we present a fundamentally different method for producing narrow-bandwidth radiation from a broad spectral bandwidth current source, which takes advantage of the inflated radiation impedance close to cut-off in a medium with a plasma-like permittivity. We find that by embedding a current source in this cut-off region, more than an order of magnitude enhancement of the radiation intensity is obtained compared with emission directly into free space. The method suggests a simple and general way to fl

SUBMITTER: Hur MS 

PROVIDER: S-EPMC5223163 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature