2014/11/24 by Alejandro Manjavacas, Sukosin Thongrattanasiri, Jean-Jacques Greffet +1 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Absorption (acoustics) #Doping #Graphene #Infrared #Light emission #Nanostructure #Plasmon #Plasmonic and Surface Plasmon Research #Resonance (particle physics) #Thermal #Thermal Radiation and Cooling Technologies #Thermal properties of materials #cond-mat.mes-hall #physics.optics
paper · pdf · doi:10.1063/1.4902429
published as Appl. Phys. Lett. 105, 211102 (2014) · 5 pages, 3 figures
openalex publication_date 2014/11/24 · arxiv created 2014/11/26 · arxiv updated 2014/11/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Infrared plasmons in doped graphene nanostructures produce large optical absorption that can be used for narrow-band thermal light emission at tunable frequencies that strongly depend on the doping charge. By virtue of Kirchhoff's law, thermal light emission is proportional to the absorption, thus resulting in narrow emission lines associated with the electrically controlled plasmons of heated graphene. Here, we show that realistic designs of graphene plasmonic structures can release over 90% of the emission through individual infrared lines with 1% bandwidth. We examine anisotropic graphene structures in which efficient heating can be produced upon optical pumping tuned to a plasmonic absorption resonance situated in the blue region relative to the thermal emission. An incoherent thermal light converter is thus achieved. Our results open a radically different approach for designing tunable nanoscale infrared light sources.