@misc{oai:repo.qst.go.jp:00079554,
 author = {Sato, Takumi and Kitaizumi, Takahiro and Saichi, Kota and Igarashi, Ryuji and Ohshima, Takeshi and Masuyama, Yuta and Iwasaki, Takayuki and Hatano, Mutsuko and Jelezko, Fedor and Kusakabe, Moriaki and Masaki Sekino and Yatsui, Takashi and Igarashi, Ryuji and Ohshima, Takeshi and Masuyama, Yuta and Hatano, Mutsuko},
 month = {Dec},
 note = {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., The 2nd International Forum on Quantum Metrology and Sensing への出席},
 title = {Improving Magnetic Sensitivity in Magnetometer with Nitrogen-Vacancy Center in a Bulk Diamond using Grating Coupler},
 year = {2019}
}