Directionality of terahertz radiation emitted from an array of femtosecond filaments in gases

N. Panov, V. Andreeva, O. Kosareva, A. Shkurinov, V. A. Makarov, L. Bergé, S. L. Chin

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

An array of filaments in air is numerically shown to be an efficient tool to direct the energy of terahertz (THz) radiation into a narrow and controllable cone. By increasing the number of filaments in an N × N array, the THz energy growth per unit angle of the cone exceeds the classical gain in N2. The backwardly directed radiation from the filament array appears when the transverse size of the array reaches the filament length. The optimum spacing between the filaments in the array is the THz wavelength, which ensures constructive interference and independent development of filaments.

Original languageEnglish (US)
Article number125401
JournalLaser Physics Letters
Volume11
Issue number12
DOIs
StatePublished - Dec 1 2014

Bibliographical note

Publisher Copyright:
© 2014 Astro Ltd.

Keywords

  • array of filaments
  • filamentation
  • terahertz radiation

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