Development of a high-sensitivity diamond magnetic quantum sensor using hybrid integration method.

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K20428
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0302:Electrical and electronic engineering and related fields
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Katsumi Ryota 豊橋技術科学大学, 工学(系)研究科(研究院), 助教 (40908505)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Keywords: ダイヤモンド / ハイブリッド集積 / 量子光学

Outline of Final Research Achievements

A quantum sensor utilizing the luminescence from nitrogen-vacancy (NV) centers in diamond has been theoretically known to enable highly sensitive magnetic detection at room temperature, and has been attracting attention as the next-generation high-performance magnetic sensor. However, the magnetic detection sensitivity based on NV centers reported so far is several orders of magnitude lower than that of existing quantum sensors. In this study, we succeeded in improving the extraction efficiency of luminescence from NV centers by about 1.6 times by integrating a grating structure on a diamond NV substrate using transfer printing, which allows for flexible integration of photonic components. We have also confirmed an improvement in magnetic detection sensitivity, which is an important achievement for the high sensitivity of diamond quantum sensors.

Free Research Field

ナノフォトニクス

Academic Significance and Societal Importance of the Research Achievements

本研究の目的とする、ダイヤモンド中集団NV中心からの発光を高効率に取り出す量子光デバイス構造が実現できれば、ダイヤモンド量子センサーにおいて大きな課題であった、磁気検出の飛躍的な感度向上が期待される。これにより、高感度な磁気検出が室温で可能となり、既存の量子センサーに代わる新しい量子磁気センサーの実現が期待される。医療分野への応用のみならず、高感度な磁気検出が必要な物性・化学分野への応用を通じて新たな学術的探求をも可能にする。