Highly sensitive magnetic field sensor using reflectrion of nano peridic structure

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K14515
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 28050:Nano/micro-systems-related
• Research Institution: The University of Tokushima
• Principal Investigator: TAKASHIMA Yuusuke 徳島大学, 大学院社会産業理工学研究部(理工学域), 助教 (10843948)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: ナノ周期構造 / 磁場センサー

Outline of Final Research Achievements

The goal of this study is demonstrating highly sensitive optical sensor for magnetic field utilizing enhancement of magneto-optical (MO) effect with nano periodic structure. To design the structure geometry for MO enhancement, the electromagnetic field distribution was analyzed, and the optical and MO characteristics of the nano structure was estimated. The optimized Ni/SiO2/Ni-nano periodic structure was fabricated using e-beam lithography and evaporation techniques, and the several-fold MO enhancement than that of 100 nm Ni-film was experimentally demonstrated.

Free Research Field

光デバイス

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は、ナノ周期構造中を利用することで、同じ材料においても光-磁場の相互作用を人工的に増強することができることを実証しており、デバイス性能が磁性体材料の物性で決まるという本質的な限界を克服する可能性を示した。また、本研究成果は、光集積回路等とも相性が良く、磁場センサーの高感度化だけにとどまらず、光波長切り替えや光アイソレーター等の全光集積回路の基盤技術への波及効果も期待できるため、その社会的な意義は大きい。