Tunable circularly polarized terahertz radiation from magnetized gas plasma

Wang, W.-M. and Gibbon, P. and Sheng, Z.-M. and Li, Y.-T. (2015) Tunable circularly polarized terahertz radiation from magnetized gas plasma. Physical Review Letters, 114 (25-26). 253901. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.114.253901)

[thumbnail of Wang-etal-PRL-2015-Tunable-circularly-polarized-terahertz-radiation]
Preview
 Text. Filename: Wang_etal_PRL_2015_Tunable_circularly_polarized_terahertz_radiation.pdf
Accepted Author Manuscript
Download (3MB)| Preview

Abstract

It is shown, by simulation and theory, that circularly or elliptically polarized terahertz radiation can be generated when a static magnetic (B) field is imposed on a gas target along the propagation direction of a two-color laser driver. The radiation frequency is determined by ω2p+ω2c/4−−−−−−−−√+ωc/2, where ωp is the plasma frequency and ωc is the electron cyclotron frequency. With the increase of the B field, the radiation changes from a single-cycle broadband waveform to a continuous narrow-band emission. In high-B-field cases, the radiation strength is proportional to ω2p/ωc. The B field provides a tunability in the radiation frequency, spectrum width, and field strength.

ORCID iDs

Wang, W.-M., Gibbon, P., Sheng, Z.-M. ORCID logoORCID: https://orcid.org/0000-0002-8823-9993 and Li, Y.-T.;
CORE (COnnecting REpositories)