THz Field Enhancement under the Influence of Cross-focused Laser Beams in the m-CNTs

Abstract

In the present analysis, we have studied the effect of cross-focused Gaussian laser beams propagating through the array of magnetized carbon nanotubes (m-CNTs) to enhance the terahertz (THz) field amplitude of emitted radiation. The plasma present in the form of CNTs rearranges itself due to the ponderomotive nonlinearity, which gives rise to the nonlinear optical phenomenon known as the cross-focusing of laser beams. The ponderomotive nonlinearity, cross-focusing of lasers, and anharmonic behavior of m-CNTs are responsible for the very strong nonlinear current density in the system. The cross-focusing effect of the propagating Gaussian laser beams increases with the increase in the externally applied static magnetic field, which is applied along the longitudinal axis of the CNTs. As a result, the normalized THz field amplitude shows a significant enhancement, and the THz radiations emitted in this way can be utilized in biological diagnosis (of the living beings) instead of X-rays. The internal and external diameters of the CNTs also make a notable impact on the THz field amplitude. HIGHLIGHTS We have studied the effect of cross-focused laser beams propagating through the magnetized carbon nanotubes to enhance the terahertz field of emitted radiation The ponderomotive nonlinearity, cross-focusing of lasers, and anharmonic behavior are responsible for the strong nonlinear current density in the system The internal and external diameters of the m- CNTs also make a notable impact on the THz field amplitude The frequency of emitted radiation shows that these can be utilized in the biological diagnosis of living beings instead of X-rays GRAPHICAL ABSTRACT