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We consider theoretically the dynamics of electric currents opticallyinjected in carbon nanotubes. Although the plasma oscillations are not seen inthese systems, the main effect on the carrier's motion is due to stronglynonuniform space-charge Coulomb forces produced by time-dependent separation ofinjected electron and hole densities. We calculate evolution of the dipolemoment characterizing the time- and coordinate-dependent charge densitydistributions and analyze different regimes of the dynamics. The developedtime-dependent dipole moment leads to a dipole radiation in the THz frequencyrange for typical parameters of injected currents.

Dynamics of optically injected currents in carbon nanotubes