Nanowerk September 8, 2020
An international team of researchers (Japan, Poland, France, Russia) has demonstrated room-temperature coherent amplification of terahertz radiation in graphene, electrically driven by a dry cell battery. They designed a series of monolayer-graphene channel transistor structures that worked as a highly efficient antenna to couple the THz radiations and graphene plasmons. They demonstrated THz radiation amplification gain of up to 9% in the monolayer graphene–far beyond the well-known landmark level of 2.3% that is the maximum available when photons directly interact with electrons without excitation of graphene plasmons. Because all results were obtained at room temperature, the experimental results pave the way toward further THz plasmonic technology with a new generation of all-electronic, resonant, and voltage-controlled THz amplifiers…read more. Open Access TECHNICAL ARTICLE