Laser-Induced Terahertz Radiation Generation in Magnetized QMCNT-Based Plasma

Laser-induced THz radiation generation by beating two collinear Gaussian laser beams of slightly different frequencies (\({\upomega }_{1},{\upomega }_{2}\)) and wave number (\({\mathrm{k}}_{1}\),\({\mathrm{k}}_{2}\)) copropagating through the array of quasi metallic carbon nanotube (QMCNT)-based plasma in an externally applied static magnetic field is proposed and investigated. An array of QMCNTs has been magnetized by applying a static magnetic field perpendicular to the direction of propagation of collinear Gaussian laser beams and along the length of QMCNTs. Collinear Gaussian laser beams interact with the atoms in QMCNT-based plasma, where the electrons of QMCNTs absorb the photon energy from the laser beams. Under the influence of laser fields and space charge fields, plasma electrons oscillate with an oscillatory velocity. When this oscillatory motion interacts with an external static magnetic field, a ponderomotive force is exerted on the electrons at the beat frequency. In the presence of nonlinear ponderomotive force, the oscillatory electrons of plasma electrons generate a non-linear current that subsequently leads to THz radiation generation. A static magnetic field applied externally within the range of 280 to 380 kG enhances the efficiency of normalized THz power by stabilizing plasma and amplifying its nonlinearity. Furthermore, the resonantly enhanced THz power occurs at a specific value of dimensions, i.e., length and width of QMCNTs. The impact of collision frequency on the amplitude and position of side peaks, which arise alongside the prominent resonance peak, is also explored. Our numerically analyzed scheme presents an efficient method for generating THz radiation, with applications in imaging, security scanning, and non-destructive testing.