Dipole nanoantennas of single-walled carbon nanotube bundles: A numerical analysis

Carbon nanotube-based nanoantennas could configure important components in devices for applications in various fields, such as sensing, imaging, and signal transmission at the nanoscale. One of the factors that can affect the properties and, therefore, the performance of the nanoantenna is the temperature. In this work, the resonance properties at different temperatures for dipole nanoantennas formed from bundles of densely packed carbon nanotubes are analyzed. Calculations are made from the Hallén equation using the dynamic quantum conductivity and an equivalent radius for the antenna based on the surface area of the bundle. Results are obtained in the range from 1 GHz to1000 GHz and temperatures from 200K to 500K. A detailed calculation of the relaxation frequency is performed to consider the possible interaction of electrons with defects and acoustic and optical phonons. Input impedance, first resonance frequency, and radiation efficiency are obtained for different numbers of nanotubes in the bundle. Results show a significant effect of the temperature and surface area of the bundle on these parameters.