High-energy, short-duration bursts of coherent terahertz radiation from an embedded plasma dipole

Kyu Been Kwon, Teyoun Kang, Hyung Seon Song, Young-Kuk Kim, Bernhard Ersfeld, Dino A. Jaroszynski, Min Sup Hur

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Emission of radiation from electrons undergoing plasma oscillations (POs) at the plasma frequency has attracted interest because of the existence of intriguing and non-trivial coupling mechanism between the electrostatic PO and the emitted electromagnetic wave. While broadband emission from plasma waves in inhomogeneous plasma is well known, the underlying physics of narrowband emission at the plasma frequency observed in experiments and in solar radio-bursts is obscure. Here we show that a spatially-localized plasma dipole oscillation (PDO) can be generated when electrons are trapped in a moving train of potential wells produced by the ponderomotive force of two slightly detuned laser pulses that collide in plasma and give rise to a burst of quasimonochromatic radiation. The energy radiated in the terahertz spectral region can reach an unprecedented several millijoules, which makes it suitable for applications requiring short pulses of high-intensity, narrowband terahertz radiation.
Original languageEnglish
Article number145
Number of pages9
JournalScientific Reports
Publication statusPublished - 9 Jan 2018


  • electrons
  • plasma oscillations
  • POs
  • plasma frequency
  • electromagnetic wave
  • plasma dipole oscillation
  • PDO

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