THz generation by propagating lasers through magnetized SWCNTs

In the present manuscript, a theoretical analysis of terahertz (THz) generation by propagating continuous wave Gaussian laser beams of slightly different angular frequencies (𝜔1,𝜔2) and corresponding wavenumbers (𝑘1,𝑘2) in the array of magnetized single-walled carbon nanotubes (SWCNTs) is provided. The static magnetic field is applied transverse to the length of SWCNTs with the purpose to magnetize the SWCNTs. The nonlinear variation in the restoration force experienced by the electrons of SWCNTs makes these SWCNTs anharmonic SWCNTs. This anharmonicity in the SWCNTs makes its contribution to the reasonable enhancement of the THz generation. In addition to that, the external magnetic field also proves its utility in the enhancement of the normalized THz amplitude of emitted THz radiation by increasing the nonlinearities of the SWCNTs. In this way, we can generate well-enhanced THz radiation at resonance point 𝜔=𝜔P0.2(1+𝛽)+(𝜔2c/𝜔2P‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾√), where 𝛽 is known as characteristic parameter associated with SWCNTs. ωP and ωc are the plasma and cyclotron frequencies of the electrons of SWCNTs, respectively. (author)