Development of non-reciprocal nanophotonic devices using ferromagnetic nanogranular films

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K21959
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 21:Electrical and electronic engineering and related fields
• Research Institution: The University of Tokyo
• Principal Investigator: Iwamoto Satoshi 東京大学, 先端科学技術研究センター, 教授 (40359667)
• Co-Investigator(Kenkyū-buntansha): 小林 伸聖 公益財団法人電磁材料研究所, その他部局等, 研究員(移行) (70205475)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: 磁気光学効果 / ナノグラニュラー膜 / フォトニック結晶 / 導波路

Outline of Final Research Achievements

It has been reported that nanogranular films (NG films) composed of magnetic nanoparticles distributed in a dielectric host material can exhibit a large magneto-optical effect in the optical communication wavelength band. In this research, we succeeded in developing a highly transparent NG film and a high refractive index NG film, which are necessary for nanophotonic applications of NG film.
We also numerically examined the performance of photonic crystal waveguides with a high-transparency NG film using fluoride as the matrix and clarified the attainable performance with the currently available material. In addition, we theoretically and numerically demonstrated that using a magneto-optical material with a dielectric constant close to zero enables the realization of one-way waveguides immune to disorders at a wide range of wavelengths around 1550 nm.

Free Research Field

ナノフォトニクス

Academic Significance and Societal Importance of the Research Achievements

本研究成果は、NG膜の磁気光学材料としての応用範囲を拡げるとともに、一方向性光導波路やそれを利用した小型アイソレータ、構造揺らぎがあっても安定に動作するレータなどへの応用が期待される。さらに、これらのデバイスは、超高密度・高機能な光回路、それを活用した光配線技術や光量子技術の高性能化の実現にも貢献し得るものでもある。