Ultra-Broadband Signal Processing

[Professor] Taiichi OtsujiUltra-Broadband Devices and Systems

[Associate Professor] Akira SatouUltra-broadband Device Physics

[Assistant Professor] Takayuki Watanabe

[Research Fellow] Juan Antonio Delgado Notario

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)

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.

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.
world-first observation of terahertz spontaneous emission in double-graphene-layered 2D atomically thin heterojunctions via photoemission-assisted resonant tunneling.

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

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.

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

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