title: Tailoring terahertz near-field enhancement via two-dimensional plasmons.
abstract: We suggest a novel possibility for electrically tunable terahertz near-field enhancement in flatland electronic materials supporting two-dimensional plasmons, including recently discovered graphene. We employ electric-field effect modulation of electron density in such materials and induce a periodic plasmonic lattice with a defect cavity. We demonstrate that the plasmons resonantly excited in such a periodic plasmonic lattice by an incident terahertz radiation can strongly pump the cavity plasmon modes leading to a deep subwavelength concentration of terahertz energy, beyond λ/1000, with giant electric-field enhancement factors up to 10(4), which is 2 orders of magnitude higher than achieved previously in metal-based terahertz field concentrators.
authors.affiliation: Kotelnikov Institute of Radio Engineering and Electronics (Saratov Branch), Russian Academy of Sciences, Zelenaya 38, Saratov 410019, Russia.
authors.forename: Arthur R
authors.initials: AR
authors.lastname: Davoyan
authors.forename: Vyacheslav V
authors.initials: VV
authors.lastname: Popov
authors.forename: Sergei A
authors.initials: SA
authors.lastname: Nikitov
mesh_terms: D006108:Graphite / Q000737:chemistry; D008962:Models, Theoretical; D058626:Plasma Gases / Q000737:chemistry; D013057:Spectrum Analysis / Q000379:methods; D055672:Static Electricity; D020349:Surface Plasmon Resonance; D055053:Terahertz Radiation
chemical_list: D058626:Plasma Gases; D006108:Graphite