title: Tunable Circularly Polarized Terahertz Radiation from Magnetized Gas Plasma.
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 √[ω(p)(2)+ω(c)(2)/4]+ω(c)/2, where ω(p) is the plasma frequency and ω(c) 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 ω(p)(2)/ω(c). The B field provides a tunability in the radiation frequency, spectrum width, and field strength.
authors.affiliation: Forschungszentrum Jülich GmbH, Institute for Advanced Simulation, Jülich Supercomputing Centre, D-52425 Jülich, Germany.|Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China.|IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: W-M
authors.initials: WM
authors.lastname: Wang
authors.affiliation: Forschungszentrum Jülich GmbH, Institute for Advanced Simulation, Jülich Supercomputing Centre, D-52425 Jülich, Germany.|Centre for Mathematical Plasma Astrophysics, Katholieke Universiteit Leuven, 3000 Leuven, Belgium.
authors.forename: P
authors.initials: P
authors.lastname: Gibbon
authors.affiliation: SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom.|Key Laboratory for Laser Plasmas (MoE) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.|IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Z-M
authors.initials: ZM
authors.lastname: Sheng
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China.|IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Y-T
authors.initials: YT
authors.lastname: Li
mesh_terms: D060733:Electromagnetic Radiation; D008280:Magnetics; D008962:Models, Theoretical; D058626:Plasma Gases / Q000737:chemistry*
chemical_list: D058626:Plasma Gases