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Ultra-Broadband Signal Processing

>> Broadband Engineering Division

Ultra-Broadband Signal Processing

Researcher

  • [ Professor ]
    Taiichi Otsuji
    Ultra-Broadband Devices and Systems
  • [ Associate Professor ]
    Akira Satou
    Ultra-broadband Device Physics
  • [ Assistant Professor ]
    Takayuki Watanabe
  • [ Research Fellow ]
    Victor Ryzhii
  • [ Research Fellow ]
    Chao Tang

Group Web Site

http://www.otsuji.riec.tohoku.ac.jp/english/index_en.php

Research Activities

Terahertz (sub-millimeter) coherent electromagnetic waves are expected to explore the potential application fields of future information and communications technologies. We are developing novel, ultra-broadband integrated signal-processing devices/systems operating in the millimeter and terahertz frequency regime.

Ultra-Broadband Devices and Systems (Prof. Otsuji)

Research topics

  • Creation of Graphene Terahertz Lasers.
  • Creation of 2D-Atomically-Thin-Layered Hetero-junctions and their Applications to Novel Terahertz Photonic Devices.
  • Physics of Graphene Dirac Plasmons and its Terahertz Functional Applications.
  • Creation of EIC (Energy-Information-Communication) Converged Resilient Network Infrastructure towards Super-Smart Society

We are developing novel, integrated electron devices and circuit systems operating in the millimeter-wave and terahertz regions. III-V- and graphene-based active plasmonic heterostructures for creating new types of terahertz lasers and ultrafast transistors are major concerns. By making full use of these world-leading device/circuit technologies, we are exploring future ultra-broadband wireless communication systems as well as spectroscopic/imaging systems for safety and security.

current-injection graphene transistor laser (DFB-DG-GFET). SEM images, measured ambipolar property, simulated modal gain and Q factor, and world-first measured single-mode THz lasing spectra.
Dual-grating-gate graphene Dirac plasmon transistor, demonstrating coherent terahertz light amplification with a four-times higher giant gain than the quantum limit

Ultra-broadband Device Physics (Assoc. Prof. Satou)

Research topics

  • 2D Plasmons in Graphene and Compound-Semiconductor Heterostructures and Their Applications to Terahertz Sources and Detectors.
  • Terahertz Optical Gain in Graphene and Its Application to Terahertz Lasers.
  • Photonics-Electronics Convergence Carrier Converters.

We are developing novel, integrated electron devices and circuit systems operating in the millimeter-wave and terahertz regions. III-V- and graphene-based active plasmonic heterostructures for creating new types of terahertz lasers and ultrafast transistors are major concerns. By making full use of these world-leading device/circuit technologies, we are exploring future ultra-broadband wireless communication systems as well as spectroscopic/imaging systems for safety and security.

Schematic view, SEM image, and measured mixing output of a UTC-PD-top-integrated HEMT photonics-electronics-convergence mixer.

Related Videos

研究室のようすThe state of the research

  • Ultra-Broadband Signal Processing
  • Ultra-Broadband Signal Processing
  • Ultra-Broadband Signal Processing