Abstract-Injection terahertz laser using the resonant inter-layer radiative transitions in double-graphene-layer structure

V. Ryzhii, A. A. Dubinov, V. Ya. Aleshkin, M. Ryzhii, T. Otsuji

http://arxiv.org/abs/1309.2724

We propose and substantiate the concept of terahertz (THz) laser enabled by the resonant electron radiative transitions between graphene layers (GLs) in double-GL structures. We estimate the THz gain for TM-mode exhibiting very low Drude absorption in GLs and show that the gain can exceed the losses in metal-metal waveguides at the low end of the THz range. The spectrum of the emitted photons can be tuned by the applied voltage. A weak temperature dependence of the THz gain promotes an effective operation at room temperature.