Simulation study on terahertz modulation with single-walled carbon nanotube array

A carbon nanotube (CNT) is a cylinder made of graphene. CNTs possess excellent properties of carbon materials, and the parallel-arranged nanotubes exhibit anisotropy additionally. The finite element method is adopted to simulate single-walled carbon nanotube (SWCNT) array in the terahertz spectrum. Under the standard size parameters we have set, Our simulation results show that between 1-3 THz, P-polarization transmittance, which is perpendicular to the SWCNTs, fluctuates around 0.5, while S-polarization transmittance, which is parallel to the SWCNTs, is around 4.8×10^-3. The reflectance parallel to the SWCNTs gradually increases to 0.407, and the reflectance perpendicular to the SWCNTs gradually decreases to nearly 1×10^-8 as the frequency increases. The simulation results provide theoretical support for further applications of SWCNTs in optical field.