Simulation results of transmission characteristics of double-walled carbon nanotube film in terahertz band

In this paper, the transmission properties of the double-walled carbon nanotube (DWCNT) films in terahertz spectrum are simulated and analyzed using the finite element method. Carbon nanotubes (CNTs) have excellent electromagnetic properties, oxidation resistance and flexibility, so it has become a material that has attracted much attention to replacing metal wire grids. The transmission of the transverse magnetic (TM) gives the power transmission of the polarizer for the component parallel to the grating vector and the transmission of the transverse electric (TE) for the perpendicular component. Our simulation results show that the transmission of the TM mode and the TE mode could be modulated by adjusting the diameter and spacing of the DWCNTs. In the range of 0.3-2.5THz, the transmission of the TM can be modulated from 90.7% to 99.3%, and TE can be modulated from 0.3% to 23%, which offers an alternative way of designing a polarizer with the desired degree of polarization. The simulation results provide numerical results in wide-band THz wave modulation with DWCNTs.