My note: The entire article can be read for free online, at the posted link.
Victor Ryzhii, Alexander A. Dubinov, Taiichi Otsuji, Vladimir Ya. Aleshkin, Maxim Ryzhii, and Michael Shur »View Author Affiliations
http://www.opticsinfobase.org/oe/fulltext.cfm?uri=oe-21-25-31567&id=276087
We propose and analyze the concept of injection terahertz (THz) lasers based on double-graphene-layer (double-GL) structures utilizing the resonant radiative transitions between GLs. We calculate main characteristics of such double-GL lasers and compare them with the characteristics of the GL lasers with intra-GL interband transitions. We demonstrate that the double-GL THz lasers under consideration can operate in a wide range of THz frequencies and might exhibit advantages associated with the reduced Drude absorption, weaker temperature dependence, voltage tuning of the spectrum, and favorable injection conditions.
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