Abstract
Terahertz (THz) radiation from a plasma cylinder with embedded radial electric and axial magnetic fields is investigated. The plasma density and the electric and magnetic fields are such that the electron plasma frequency is near the electron cyclotron frequency and in the THz regime. Two-dimensional particle-in-cell simulations show that the plasma electrons oscillate not only in the azimuthal direction but also in the radial direction. Spectral analysis shows that the resulting oscillating current pattern has a clearly defined characteristic frequency near the electron cyclotron frequency, suggesting resonance between the cyclotron and plasma oscillations. The resulting far-field THz radiation in the axial direction is also discussed.
Highlights
Introduction e frequency regime ofTerahertz (THz) radiation lies between that of microwaves and optical waves
Many approaches have been proposed for generating T-rays, including synchrotron radiation [1], optical transition radiation [2, 3], and nonlinear frequency upconversion [4]
Optical transition radiation is produced by relativistic electrons as they cross the interface of different dielectric media
Summary
We consider here an unusual source of THz radiation, namely, from a plasma cylinder with external radial electric field and axial magnetic field, as shown in Figure 1. e electric field producing the plasma could be from a radial capacitor discharge and the magnetic field from a solenoid coil outside the cylinder. e electron motion is governed by. E electric field producing the plasma could be from a radial capacitor discharge and the magnetic field from a solenoid coil outside the cylinder. To investigate the evolution of such a plasma cylinder, we use the 2D3V (two-dimensional in space and threedimensional in velocity) PIC simulation code LAPINE [28]. E spatial mesh has 1024 ×1024 cells, containing 4 ×107 each of electrons and ions, and the simulation time step is 13 fs. The ion dynamics is fully included, as they might play a role in the long-time behavior of the system
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