2007/10/18 by Farhan Rana
Engineering · Physics and Astronomy · #Condensed matter physics #Graphene #Localized surface plasmon #Materials science #Nanotechnology #Optoelectronics #Photonic Crystals and Applications #Physics #Plasmon #Plasmonic and Surface Plasmon Research #Surface plasmon #Terahertz radiation #Thermal Radiation and Cooling Technologies #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1109/tnano.2007.910334
To appear in IEEE Transactions on Nanotechnology (TNANO)
arxiv created 2007/10/18 · openalex publication_date 2008/01/01 · arxiv updated 2015/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this paper we propose and discuss coherent terahertz sources based on charge density wave (plasmon) amplification in two-dimensional graphene. The coupling of the plasmons to interband electron-hole transitions in population inverted graphene layers can lead to plasmon amplification through stimulated emission. Plasmon gain values in graphene can be very large due to the small group velocity of the plasmons and the strong confinement of the plasmon field in the vicinity of the graphene layer. We present a transmission line model for plasmon propagation in graphene that includes plasmon dissipation and plasmon interband gain due to stimulated emission. Using this model, we discuss design for terahertz plasmon oscillators and derive the threshold condition for oscillation taking into account internal losses and also losses due to external coupling. The threshold condition is shown to depend on the ratio of the external impedance and the characteristic impedance of the plasmon transmission line. The large gain values available at terahertz frequencies in graphene can lead to integrated oscillators that have dimensions in the 1-10 mum range.