Simulation study of terahertz radiation generation by circularly polarized laser pulses propagating in axially magnetized plasma

Abstract

This paper deals with a two-dimensional simulation study of terahertz radiation emission in the wake of circularly polarized laser pulses propagating in uniformly magnetized plasma, using the XOOPIC code. The external magnetic field is applied along the direction of propagation of the laser pulse. It is seen that linearly polarized terahertz radiation is emitted off-axis, along the propagation direction, in plasma. This emitted radiation is also seen to be transmitted in vacuum. Simulation studies reveal that no such radiation is generated on-axis for the given configuration.

Generation of tunable terahertz radiation by a laser pulse propagating in a magnetized plasma channel

“…where ⃗ J (= −n e e⃗ v) is the current density attributed to the interaction of plasma electrons with the laser and applied magnetic field. Further, QSA [15] is applied to the set of equations ( 10) and (11). Under QSA, laser pulse evolution is insignificant as it transits the plasma electrons.…”

“…Under this assumption transverse variations of the transverse fields E y,z and B y,z are neglected in comparison with transverse variation of longitudinal fields and axial variations of all generated fields. Therefore, the x components of equations ( 10) and (11), respectively, give B (2) x = 0, (…”

“…The presence of external or self-generated magnetic fields significantly affects the process of the laser-plasma interaction, leading to many interesting phenomena. Analytical and simulation studies of THz radiation generation by circularly polarized laser pulses in plasma with a magnetic field applied axially have been reported [10,11]. THz emission by laser-plasma interaction in arbitrarily oriented magnetic fields has recently been reported by Mishra et al [12].…”