IEEE EDS Distinguished Lecturer Seminar
In this DL seminar, Prof. Taiichi Otsuji gives a lecture on 2D Plasmons in topological insulator and Dirac materials for THz lasers & detectors” .
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- 2-12-1, Ookayama,
- Meguro-ku, Tokyo, Tokyo
- Japan 152-8550
- Building: Digital Multi-Purpose Hall
- Starts 13 August 2026 03:00 PM UTC
- Ends 07 November 2026 03:00 PM UTC
- No Admission Charge
Agenda
This lecture will provide a thorough overview of 2D plasmons in topological insulators and Dirac materials for terahertz (THz) lasers and detectors. The lecture will cover the following topics: 1) the fundamental basis of Dirac plasmons in graphene, topological insulators and other related two-dimensional (2D) materials; 2) the physical principles of photonic and plasmonic THz lasing, as well as plasmonic, photothermoelectric and bolometric detection; 3) the recent trends in transistor-based device structures and their performance benchmarking; and 4) future trends and prospects. The THz range (0.1–10 THz) remains a technological gap between electronics and photonics because compact, room-temperature sources and detectors are limited. Dirac plasmons in graphene, topological insulators, and related two-dimensional materials offer a promising way to bridge the THz gap. These systems can enable THz emission and detection within unified device architectures due to their ultrahigh carrier mobility, viscous nonlinear hydrodynamics, strong light-matter coupling, and electrical tunability. We present Dirac plasmonic transistor structures featuring graphene and related 2D materials, including black phosphorene, black arsenic phosphorene, and Bi2Se3 and Bi2Te3, as well as Bi2Te3/Te eutectic heterostructures, which serve as channel materials. These structures employ asymmetric dual- or triple-grating-gate electrodes and exhibit current-driven amplification and Coulomb drag instability as high-gain mechanisms. They also implement plasmonic, photothermoelectric, and bolometric detection, which employ novel rectification mechanisms, including three-dimensional (3D) rectification and photothermionic-emission-assisted bolometric rectification. These mechanisms achieve high responsivities and ultrafast responses. These results establish a scalable platform for compact, low-power, room-temperature THz systems.