2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/134797It is shown that the massless energy spectrum of electrons and holes in graphene leads to the strongly non-linear electromagnetic response of this system. We predict that the graphene layer, irradiated by electromagnetic waves, emits radiation at higher frequency harmonics and can work as a frequency multiplier. The operating frequency of the graphene frequency multiplier can lie in a broad range from microwaves to the infrared.5 pages, 3 figuresMesoscale and Nanoscale Physicstext