量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Introduction
Based on the magnetic sensing system to investigate tumor metastases using Hall sensor with permanent magnet, we are investigating into the improvement of magnetic sensitivity using Nitrogen-Vacancy (NV) center in a bulk diamond1). However, light extraction efficiency of diamond is low because of its high refractive index of diamond. To meet the requirement, we performed the numerical optimization using a FDTD method of the grating coupler over the diamond substrate.
Method
We performed the numerical optimization of the number and pitch of grating using a Finite Difference Time Domain (FDTD) method of the grating coupler over the diamond substrate. We compared the enhancement of the optical intensity with and without grating (FIG. 1). The increased rate represents the enhancement of electric field with grating with respect that without grating.
会議概要（会議名, 開催地, 会期, 主催者等）
The 2nd International Forum on Quantum Metrology and Sensing への出席
Improving Magnetic Sensitivity in Magnetometer with Nitrogen-Vacancy Center in a Bulk Diamond using Grating Coupler
