Azimuthally polarized terahertz radiation generation using radially polarized laser pulse in magnetized plasma

TL;DR

This paper presents an analytical and simulation study of azimuthally polarized terahertz radiation generated by radially polarized laser pulses in magnetized plasma, highlighting parameter control of radiation amplitude.

Contribution

It provides a new analytical formulation and validation via PIC simulations for THz radiation generation in magnetized plasma using radially polarized laser pulses.

Findings

Generated THz fields propagate beyond plasma boundary.

Field amplitude scales nonlinearly with plasma density.

Field amplitude increases linearly with magnetic field strength.

Abstract

An analytical formulation of a radially polarized laser pulse propagating in a homogeneous, magnetized plasma is presented using Lorentz force, continuity and Maxwells equations. Perturbation technique and quasi-static approximation (QSA) have been used to study the generated fields in nonlinear regime. The generated slow, oscillating, transverse electric and magnetic fields having equal amplitude, constitute a radiation field having frequency in the terahertz (THz) range. Particle-in-cell (PIC) simulation code FBPIC is used to validate analytical findings. Simulation studies also show that the generated THz radiation field propagates beyond the plasma boundary, indicating coherent electromagnetic radiation emission. Furthermore, the field amplitude scales nonlinearly with plasma density and increases linearly with external magnetic field strength, highlighting the role of these parameters in controlling radiation amplitude.