title: Terahertz radiation from a laser plasma filament.
abstract: By the use of two-dimensional particle-in-cell simulations, we clarify the terahertz (THz) radiation mechanism from a plasma filament formed by an intense femtosecond laser pulse. The nonuniform plasma density of the filament leads to a net radiating current for THz radiation. This current is mainly located within the pulse and the first cycle of the wakefield. As the laser pulse propagates, a single-cycle and radially polarized THz pulse is constructively built up forward. The single-cycle shape is mainly due to radiation damping effect.
authors.affiliation: Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany. hcwu@lanl.gov
authors.forename: H-C
authors.initials: HC
authors.lastname: Wu
authors.forename: J
authors.initials: J
authors.lastname: Meyer-Ter-Vehn
authors.forename: H
authors.initials: H
authors.lastname: Ruhl
authors.forename: Z-M
authors.initials: ZM
authors.lastname: Sheng