Plasmon Amplification through Stimulated Emission at Terahertz Frequencies in Graphene
نویسندگان
چکیده
We show that plasmons in two-dimensional graphene can have net gain at terahertz frequencies. The coupling of the plasmons to interband electron-hole transitions in population inverted graphene layers can lead to plasmon amplification through the process of stimulated emission. We show that the net gain values can exceed 10 cm−1 in the 1-10 terahertz frequency range, for electron-hole densities in the 10-10 cm−2 range, even when plasmon energy loss due to intraband scattering is considered. Such high gain values could allow extremely compact terahertz amplifiers and oscillators that have dimensions in the 1-10 μm range.
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