투고논문
| JKMRS Volume 24, No 1, pp 9, ESR detection of optically-induce... | |
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| 2020년 03월 20일 / 조회수: 934 | |
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ESR detection of optically-induced hyperpolarization of nitrogen vacancy centers in diamond
Min-Gi An1,†, Jeong Hyun Shim2,3†, Kiwoong Kim2,3, Sangwon Oh2*, and Keunhong Jeong1,*
1Department of Chemistry, Korea Military Academy, Seoul 01805, Republic of Korea 2Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea 3Deparment of Medical Physics, University of Science and Technology, Daejeon 34113, Republic of Korea
Received Mar 16, 2020; Revised Mar 17, 2020; Accepted Mar 17, 2020
Abstract Nitrogen vacancy center (NV center) in diamond has recently been appeared as a promising candidate for hyperpolarization applications due to its optical pumping property by laser. Optically Detected Magnetic Resonance (ODMR) has been used as a conventional method to obtain the resonance spectrum of NV centers. ODMR, however, has a shortcoming of sensitivity and a limitation of subjects, such that the degree of hyperpolarization can hardly be estimated, and that the spins other than NV centers are invisible. In contrast, Electron Spin Resonance (ESR) spectroscopy is known to proportionally reflect the degree of spin polarization. In this work, we successfully observed the optically-induced hyperpolarization of NV spins in diamond through CW-ESR spectroscopy with an X-band system. All the NV peaks were identified by calculating the eigenvalues of NV spin Hamiltonian. The intensities of NV peaks were enhanced over 240 times after optical pumping. The enhanced peaks corresponding to the transition from |ms=0> to |ms=-1> revealed inverted phases, while other peaks remained in-phase. The optically-induced hyperpolarization on NV spins can be a useful polarization source, leading to 13C nuclear hyperpolarization in diamond.
Keywords Nitrogen vacancy center, electron spin resonance, hyperpolarization, optical pumping
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| 첨부파일 | 2_JKMRS_An and Shim et al.pdf |