Researcher

Group Web Site

https://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.

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.

For creation of millimeter-wave/terahertz devices based on new materials and/or new operation principles, we are theoretically and experimentally investigating physics in the devices such as electron-transport phenomena and optoelectronic properties. Furthermore, we are conducting research and development of the devices for their applications to future ultra-fast wireless communications and photonics-electronics convergence networks.

Ultra-broadband Quantum Electronics (Assoc. Prof. Lin)

Research topics

• Research on hetero/quantum structures of compound semiconductors and two-dimensional thin films and their terahertz applications.
• Research on optoelectronic devices and their communication applications in high-capacity wireless networks.
• Research on physical properties of hetero/quantum structures in quantum cascade lasers and their mid-infrared to terahertz applications.

We are creating semiconductor optoelectronic devices in the millimeter-wave and terahertz regions, theoretically and experimentally study on electronic transport and optoelectronic properties at novel materials and hetero/quantum structures. Research and development of high-intensity terahertz sources, high-efficiency photoelectric convertor and detector for future ultra-broadband wireless communication systems.

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