Magnetic field enhanced strong THz generation by the array of AR-CNTs

In the present manuscript, we study a new scheme for the magnetic field enhanced strong terahertz (THz) generation by the array of anharmonic rippled carbon nanotubes (AR-CNTs). For this purpose, we propagate a Gaussian laser beam through the array of AR CNTs forested on the dielectric substrate. The AR-CNTs have been magnetized with the help of an external magnetic field applied mutually perpendicular to the direction of propagation of the Gaussian laser beam. The Gaussian laser beam interacts with the AR-CNTs to exert a nonlinear ponderomotive force on the electrons of AR-CNTs. This is responsible for the generation of nonlinear current and THz radiation. By incorporating an externally applied static magnetic field and by varying the inter-tube separation distance of AR-CNTs, the normalized THz field amplitude of the generated waves can be tuned according to the requirement of the application. We have also observed that an externally applied static magnetic field in the optimized range of 75–95 kG paves the way for the resonantly excited strong normalized THz field amplitude with higher energy efficiency.