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

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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 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.
Original languageEnglish
Article number40034
Pages (from-to)1-9
Number of pages9
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 10 Jan 2017

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cut-off
impedance
bandwidth
radiation
vacuum tubes
electromagnetic pulses
bunching
free electron lasers
embedding
radiant flux density
light sources
permittivity
tubes
broadband
waveguides
color
vacuum
augmentation
pulses
cells

Keywords

  • electromagnetic pulses
  • narrow bandwidth radiation
  • bandwidth pulses

Cite this

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title = "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 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.",
keywords = "electromagnetic pulses, narrow bandwidth radiation, bandwidth pulses",
author = "Hur, {M. S.} and B. Ersfeld and A. Noble and H. Suk and Jaroszynski, {D. A.}",
year = "2017",
month = "1",
day = "10",
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language = "English",
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pages = "1--9",
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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

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SP - 1

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JO - Scientific Reports

JF - Scientific Reports

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ER -