Abstract
| Original language | English |
|---|---|
| Article number | 40034 |
| Pages (from-to) | 1-9 |
| Number of pages | 9 |
| Journal | Scientific Reports |
| Volume | 7 |
| DOIs | |
| Publication status | Published - 10 Jan 2017 |
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Keywords
- electromagnetic pulses
- narrow bandwidth radiation
- bandwidth pulses
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Increased impedance near cut-off in plasma-like media leading to emission of high-power, narrow-bandwidth radiation. / Hur, M. S.; Ersfeld, B.; Noble, A.; Suk, H.; Jaroszynski, D. A.
In: Scientific Reports, Vol. 7, 40034, 10.01.2017, p. 1-9.Research output: Contribution to journal › Article
TY - JOUR
T1 - Increased impedance near cut-off in plasma-like media leading to emission of high-power, narrow-bandwidth radiation
AU - Hur, M. S.
AU - Ersfeld, B.
AU - Noble, A.
AU - Suk, H.
AU - Jaroszynski, D. A.
PY - 2017/1/10
Y1 - 2017/1/10
N2 - 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 flexibly use broadband current sources to produce broad or narrow bandwidth pulses. As an example, we demonstrate, using particle-in-cell simulations, enhanced monochromatic emission of terahertz radiation using a two-colour pumped current source enclosed by a tapered waveguide.
AB - 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 flexibly use broadband current sources to produce broad or narrow bandwidth pulses. As an example, we demonstrate, using particle-in-cell simulations, enhanced monochromatic emission of terahertz radiation using a two-colour pumped current source enclosed by a tapered waveguide.
KW - electromagnetic pulses
KW - narrow bandwidth radiation
KW - bandwidth pulses
UR - http://www.nature.com/srep/about
U2 - 10.1038/srep40034
DO - 10.1038/srep40034
M3 - Article
VL - 7
SP - 1
EP - 9
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
M1 - 40034
ER -