Optical detection of magnetic resonance in nitrogen vacancy centre ensembles in bulk diamond using an off-resonant probe laser beam

Macrae, C. D. and Fraczek, E. and Newton, M. E. and Dhillon, H. and Bennett, A. and Markham, M. and Diggle, P. and Breeze, B. G. and Dale, M. and Savitski, V. and Griffin, P. F. and Kemp, A. and Riis, E. and McConnell, G. (2017) Optical detection of magnetic resonance in nitrogen vacancy centre ensembles in bulk diamond using an off-resonant probe laser beam. In: The European Conference on Lasers and Electro-Optics 2017. OSA - The Optical Society, Munich, Germany. ISBN 978-1-5090-6736-7

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    Abstract

    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 [1]. The optical excitation also spin polarises the negatively charged NV centres, permitting optical detection of magnetic resonance [2]. This allows nanotesla scale sensitive magnetometry to be performed with nanometre scale spatial resolution [3]. Generally, fluorescence based detection is used in magnetometric applications where photons are emitted in all directions thus making collection difficult. By utilising stimulated emission, the photons could be predominantly channelled into a single mode, thus greatly simplifying collection. This is especially important as the magnetometric sensitivity is proportional to the number of collected photons [3].