Strong terahertz emission from electromagnetic diffusion near cutoff in plasma

M-H Cho, Y-K Kim, H Suk, B Ersfeld, D A Jaroszynski, M S Hur

Research output: Contribution to journalArticle

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Abstract

A new mechanism for electromagnetic emission in the terahertz (THz) frequency regime from laser-plasma interactions is described. A localized and long-lasting transverse current is produced by two counter-propagating short laser pulses in weakly magnetized plasma.We show that the electromagnetic wave radiating from this current source, even though its frequency is close to cut-off of the ambient plasma, grows and diffuses towards the plasma-vacuum boundary, emitting a strong monochromatic THz wave. With driving laser pulses of moderate power, the THz wave has a field strength of tens of MVm−1, a frequency of a few THz and a quasi-continuous power that exceeds all previous monochromatic THz sources. The novelty of the mechanism lies in a diffusing electromagnetic wave close to cut-off, which is modelled by a continuously driven complex diffusion equation.
Original languageEnglish
Article number043045
Number of pages8
JournalNew Journal of Physics
Volume17
Issue number4
DOIs
Publication statusPublished - 22 Apr 2015

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cut-off
electromagnetism
electromagnetic radiation
laser plasma interactions
pulses
lasers
field strength
counters
vacuum

Keywords

  • laser-plasma
  • terahertz radiation
  • laser wakefield

Cite this

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abstract = "A new mechanism for electromagnetic emission in the terahertz (THz) frequency regime from laser-plasma interactions is described. A localized and long-lasting transverse current is produced by two counter-propagating short laser pulses in weakly magnetized plasma.We show that the electromagnetic wave radiating from this current source, even though its frequency is close to cut-off of the ambient plasma, grows and diffuses towards the plasma-vacuum boundary, emitting a strong monochromatic THz wave. With driving laser pulses of moderate power, the THz wave has a field strength of tens of MVm−1, a frequency of a few THz and a quasi-continuous power that exceeds all previous monochromatic THz sources. The novelty of the mechanism lies in a diffusing electromagnetic wave close to cut-off, which is modelled by a continuously driven complex diffusion equation.",
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Strong terahertz emission from electromagnetic diffusion near cutoff in plasma. / Cho, M-H; Kim, Y-K; Suk, H; Ersfeld, B; Jaroszynski, D A; Hur, M S.

In: New Journal of Physics, Vol. 17, No. 4, 043045, 22.04.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Strong terahertz emission from electromagnetic diffusion near cutoff in plasma

AU - Cho, M-H

AU - Kim, Y-K

AU - Suk, H

AU - Ersfeld, B

AU - Jaroszynski, D A

AU - Hur, M S

PY - 2015/4/22

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N2 - A new mechanism for electromagnetic emission in the terahertz (THz) frequency regime from laser-plasma interactions is described. A localized and long-lasting transverse current is produced by two counter-propagating short laser pulses in weakly magnetized plasma.We show that the electromagnetic wave radiating from this current source, even though its frequency is close to cut-off of the ambient plasma, grows and diffuses towards the plasma-vacuum boundary, emitting a strong monochromatic THz wave. With driving laser pulses of moderate power, the THz wave has a field strength of tens of MVm−1, a frequency of a few THz and a quasi-continuous power that exceeds all previous monochromatic THz sources. The novelty of the mechanism lies in a diffusing electromagnetic wave close to cut-off, which is modelled by a continuously driven complex diffusion equation.

AB - A new mechanism for electromagnetic emission in the terahertz (THz) frequency regime from laser-plasma interactions is described. A localized and long-lasting transverse current is produced by two counter-propagating short laser pulses in weakly magnetized plasma.We show that the electromagnetic wave radiating from this current source, even though its frequency is close to cut-off of the ambient plasma, grows and diffuses towards the plasma-vacuum boundary, emitting a strong monochromatic THz wave. With driving laser pulses of moderate power, the THz wave has a field strength of tens of MVm−1, a frequency of a few THz and a quasi-continuous power that exceeds all previous monochromatic THz sources. The novelty of the mechanism lies in a diffusing electromagnetic wave close to cut-off, which is modelled by a continuously driven complex diffusion equation.

KW - laser-plasma

KW - terahertz radiation

KW - laser wakefield

UR - http://iopscience.iop.org/1367-2630

U2 - 10.1088/1367-2630/17/4/043045

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