Effect of electromagnetic radiation on an array of weakly interacting carbon nanotubes in the presence of nanosecond pulses. Semiconductors Volume 47, Issue 9, September 2013, Pages 1246-1251

For metallic "zigzag"-type carbon nanotubes, the dependence of a nonlinear current on an ac electric field with an inclined-leading-edge width of ΔT = 3 × 10-11 s and wavelength of λ ≈ 1 mm is studied. It is theoretically and numerically shown that the surface current is almost independent of the nanotube radius. In the case of semiconductor zigzag-type nanotubes, the radiation of a two-frequency CO2 laser with a constant amplitude is considered as an ac electric field. The dependence on the relaxation time in the Boltzmann kinetic equation is studied. The optimal conditions for terahertz-radiation generation are achieved when the relaxation time is 40 fs. It is numerically found that the amplified radiation amplitude behaves as beats.