Article

Journal of Infrared, Millimeter, and Terahertz Waves

, Volume 32, Issue 5, pp 629-645

First online:

Emission of Terahertz Radiation from Two-Dimensional Electron Systems in Semiconductor Nano- and Hetero-Structures

  • Taiichi OtsujiAffiliated withResearch Inst. of Electrical Communication, Tohoku University Email author 
  • , Takayuki WatanabeAffiliated withResearch Inst. of Electrical Communication, Tohoku University
  • , Amine El MoutaouakilAffiliated withResearch Inst. of Electrical Communication, Tohoku University
  • , Hiromi KarasawaAffiliated withResearch Inst. of Electrical Communication, Tohoku University
  • , Tsuneyoshi KomoriAffiliated withResearch Inst. of Electrical Communication, Tohoku University
  • , Akira SatouAffiliated withResearch Inst. of Electrical Communication, Tohoku University
  • , Tetsuya SuemitsuAffiliated withResearch Inst. of Electrical Communication, Tohoku University
  • , Maki SuemitsuAffiliated withResearch Inst. of Electrical Communication, Tohoku University
  • , Eiichi SanoAffiliated withResearch Center for Integrated Quantum Electronics, Hokkaido University
    • , Wojciech KnapAffiliated withUniversity of Montpellier & Centre National de la Recherche Scientifique
    • , Victor RyzhiiAffiliated withComputational Nano-Electronics Laboratory, University of Aizu

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Abstract

This paper reviews recent advances in emission of terahertz radiation from two-dimensional (2D) electron systems in semiconductor nano-heterostructures. 2D plasmon resonance is first presented to demonstrate intense broadband terahertz emission from InGaP/InGaAs/GaAs and InAlAs/InGaAs/InP material systems. The device structure is based on a high-electron mobility transistor and incorporates the author’s original interdigitated dual-grating gates. Second topic focuses on graphene, a monolayer carbon-atomic honeycomb lattice crystal, exhibiting unique carrier transport and optical properties owing to massless and gapless energy spectrum. Coherent stimulated terahertz emission from femtosecond infrared-laser pumped epitaxial graphene is experimentally observed, reflecting the occurrence of negative dynamic conductivity and population inversion.

Keywords

Terahertz emission Two-dimensional electrons Plasmons Graphene Heterostructures