Wednesday, January 8th, 2014

Tsukuba, Japan, Jan 8, 2014 -- (ACN Newswire) -- As the recent demand for optical interconnections is increased, much attention has been paid to silicon photonics because of the small device footprint and CMOS compatible process. An optical isolator is essential for protecting optical active devices from reflected light even in short-distance transmission systems. However, the bottleneck of integrated optical isolator lies in difficulty in growing magneto-optical garnet crystals on commonly used optical waveguide platforms such as silicon.

The authors, Yuya Shoji and Tetsuya Mizumoto, Tokyo Institute of Technology, approached the problem using a direct bonding technique which realizes direct contact of different materials. The authors have demonstrated the first optical isolator on silicon waveguide platforms. In this paper published in Science and Technology of Advanced Materials, they describe the direct bonding, design of the waveguide isolator, and recent progress on a silicon isolator with an optical isolation of 30 dB and a four port optical circulator. In the paper, they also introduce approaches done by other research groups. Compared to the state-of-the-art deposition approach, the bonding technique is advantageous because a single-crystalline magneto-optical garnet having a large magneto-optical effect can be used.

Yuya Shoji and Tetsuya Mizumoto: Sci. Technol. Adv. Mater. Vol. 15 (2014) p. 014602.

Contact authors:
Yuya Shoji, Tetsuya Mizumoto
Department of Electrical and Electronic Engineering
Tokyo Institute of Technology
2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
E-mail: [email protected], [email protected]

Press release by ResearchSEA on behalf of National Institute of Materials Science.

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