期刊
NANO LETTERS
卷 14, 期 11, 页码 6443-6448出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl502988n
关键词
Nitrogen vacancy center; diamond; single-molecule spin; magnetometry; all-optical
类别
资金
- Defense Advanced Research Projects Agency (QuASAR program)
- NSF
- CUA
- ARO MURI
- Element Six Inc
- Packard Foundation
- NSERC
- NDSEG
- Direct For Mathematical & Physical Scien
- Division Of Physics [1125846, 0969816] Funding Source: National Science Foundation
We demonstrate an all-optical method for magnetic sensing of individual molecules in ambient conditions at room temperature. Our approach is based on shallow nitrogen-vacancy (NV) centers near the surface of a diamond crystal, which we use to detect single paramagnetic molecules covalently attached to the diamond surface. The manipulation and readout of the NV centers is all-optical and provides a sensitive probe of the magnetic field fluctuations stemming from the dynamics of the electronic spins of the attached molecules. As a specific example, we demonstrate detection of a single paramagnetic molecule containing a gadolinium (Gd3+) ion. We confirm single-molecule resolution using optical fluorescence and atomic force microscopy to colocalize one NV center and one Gd3+-containing molecule. Possible applications include nanoscale and in vivo magnetic spectroscopy and imaging of individual molecules.
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