Small magnetless integrated optical isolator using a magnetized cobalt ferrite film

• Serrano-Núñez Mario Alberto

  Department of Electrical and Electronic Engineering, Tokyo Institute of Technology

• Shoji Yuya

  Department of Electrical and Electronic Engineering, Tokyo Institute of Technology FIRST, Tokyo Institute of Technology

• Mizumoto Tetsuya

  Department of Electrical and Electronic Engineering, Tokyo Institute of Technology

抄録

We experimentally demonstrated a silicon optical isolator using a monolithically integrated cobalt ferrite (CFO) film as magneto-optical material, achieving an isolation ratio of 9.6dB near 1550nm wavelength. By virtue of the large Faraday rotation coefficient of CFO, the device has a compact footprint comparing to the current yttrium iron garnet-based isolators. Furthermore, we demonstrated self-biased isolation by the strong remanence of CFO films, eliminating the tedious demand of an external magnet. Cobalt ferrite represents a potential alternative approach to yttrium iron garnets to realize a practical device for on-chip isolation in silicon photonic integrated circuits because of the small footprint.

収録刊行物

• IEICE Electronics Express

  IEICE Electronics Express 19 (2), 20210500-20210500, 2022-01-25

  一般社団法人 電子情報通信学会

キーワード

• silicon photonics
• optical isolators
• micro ring resonators
• magneto-optical materials
• cobalt ferrite films

詳細情報

• CRID: 1390572321594204160
• NII論文ID: 130008144297
• DOI: 10.1587/elex.18.20210500
• ISSN: 13492543
• Web Site: https://www.jstage.jst.go.jp/article/elex/19/2/19_18.20210500/_pdf
• 本文言語コード: en
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