Ishikawa, Yasuhiko

Japanese

Affiliation	Department of Electrical and Electronic Information Engineering
Title	Professor
Fields of Research	Semiconductor Devices, Silicon Photonics
Degree	Ph.D. (Hokkaido University)
Academic Societies	Japan Society of Applied Physics, IEEE, SPIE, MRS, ECS
E-mail	ishikawa@ee Please append ".tut.ac.jp" to the end of the address above.
Laboratory website URL	http://www.int.ee.tut.ac.jp/photon/
Researcher information URL（researchmap）	Researcher information

Research

Silicon photonics is a technology to integrate ultrasmall photonic devices on a Si chip using LSI processes. Such integrated photonic devices are strongly required for low-power and high-capacity information transmission. High-preformance active photonic devices operating at the near-infrared communication wavelengths (1.3-1.6 μm) are integrated on a Si chip with passive photonic devices such as optical waveguides and optical filters. Based on state-of-the-art SiGe epitaxial growth technology, novel photonic devices using group-IV epitaxial layers on Si are proposed and realized.

Theme1：Si-based Waveguides

Overview

Si/Si nitride waveguides enable light propagation on a Si chip for high-capacity optical communications (wavelength: 1.3 - 1.6 µm) as well as optical interconnections in high-performance LSIs such as AI chips. Photonic integration chips are fabricated on standard bulk Si wafers as well as SOI (Si-on-insulator) wafers.

Theme2：Ge-on-Si Photodetectors

Overview

Photodetectors are inevitably necessary to convert optical signals to electrical ones for the processing with LSIs. Ge, a group-IV semiconductor similar to Si, has a good compatibility with Si processing technology. Integrated photodetectors of high-quality Ge epitaxial layer have been realized.

Theme3：Novel Ge-on-Si Devices

Overview

Ge is an indirect bandgap semiconductor, while theoretical investigations have shown that excellent optical properties, similar to direct semiconductors, can be obtained applying the band engineering. Novel photonic devices are under investigations such as optical intensity/phase modulators and light emitters (particularly, lasers).

Title of class

Analytical Electromagnetism II
Electromagnetic Wave Engineering
Engineering and Science Laboratory
Quantum Optoelectronics