2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/231306The linear electrodynamic properties of graphene -- the frequency-dependent conductivity, the transmission spectra and collective excitations -- are briefly outlined. The non-linear frequency multiplication effects in graphene are studied, taking into account the influence of the self-consistent-field effects and of the magnetic field. The predicted phenomena can be used for creation of new devices for microwave and terahertz optics and electronics.11 pages, 4 figures, a paper for Proceedings of the ICSNN 2008Mesoscale and Nanoscale PhysicsMaterials Sciencetext