Nitrogen vacancy (NV) centres are a type of defect in diamond that exhibit a number of interesting properties. NV centres can be optically excited around 450-650 nm and emit fluorescence at around 550-800 nm . The optical excitation also spin polarises the negatively charged NV centres, permitting optical detection of magnetic resonance . This allows nanotesla scale sensitive magnetometry to be performed with nanometre scale spatial resolution .
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