期刊
NEW JOURNAL OF PHYSICS
卷 18, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/18/1/013040
关键词
nitrogen-vacancy (NV); dynamical nuclear polarisation (DNP); nuclear magnetic resonance (NMR); diamond
资金
- ERC Synergy grant BioQ
- ERC Synergy grant PoC
- EU (DIADEMS)
- EU (EQUAM)
- EU (SIQS)
- DFG [SFB TRR/21, FOR 1493]
- Volkswagenstiftung
- JSPS KAKENHI Bundesministerium fur Bildung und Forschung (ARHES award) [26246001]
- Alexander von Humboldt Professorship
- IQST
- Grants-in-Aid for Scientific Research [26220903, 26246001] Funding Source: KAKEN
The sensitivity of magnetic resonance imaging (MRI) depends strongly on nuclear spin polarisation and, motivated by this observation, dynamical nuclear spin polarisation has recently been applied to enhance MRI protocols (Kurhanewicz et al 2011 Neoplasia 13 81). Nuclear spins associated with the C-13 carbon isotope (nuclear spin I = 1/2) in diamond possess uniquely long spin lattice relaxation times (Reynhardt and High 2011 Prog. Nucl. Magn. Reson. Spectrosc. 38 37). If they are present in diamond nanocrystals, especially when strongly polarised, they form a promising contrast agent for MRI. Current schemes for achieving nuclear polarisation, however, require cryogenic temperatures. Here we demonstrate an efficient scheme that realises optically induced C-13 nuclear spin hyperpolarisation in diamond at room temperature and low ambient magnetic field. Optical pumping of a nitrogen-vacancy centre creates a continuously renewable electron spin polarisation which can be transferred to surrounding C-13 nuclear spins. Importantly for future applications we also realise polarisation protocols that are robust against an unknown misalignment between magnetic field and crystal axis.
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