Manipulation of polarisations for broadband terahertz waves emitted from laser plasma filaments

Zhelin Zhang, Yanping Chen, Sen Cui, Feng He, Min Chen, Zhen Zhang, Jin Yu, Liming Chen, Zhengming Sheng, Jie Zhang

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)
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Polarization control of broadband terahertz waves is essential for applications in many areas such as material sciences, medical and biological diagnostics, near-field communications and public securities. Conventional methods for polarization control are limited to narrow bandwidth and often with low efficiency. Here based upon theoretical and experimental studies, we demonstrate that the two-colour laser scheme in gas plasma can provide effective control of elliptically polarized terahertz waves, including their ellipticity, azimuthal angle, and chirality. This is achieved with a circularly-polarized laser at the fundamental frequency and its linearly polarized second harmonic, a controlled phase difference between these two laser components, as well as a suitable length of the laser plasma filament. A flexible control of their ellipticity and azimuthal angle is demonstrated with our theoretical model and systematic experiments. This offers a unique and flexible technique on the polarization control of broadband terahertz radiation suitable for wide applications.
Original languageEnglish
Pages (from-to)554-559
Number of pages6
JournalNature Photonics
Publication statusPublished - 27 Aug 2018


  • broadband terahertz waves
  • polarization control
  • gas plasma
  • laser plasma filament

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