Microwave-free nuclear magnetic resonance at molecular scales

James D. A. Wood (), Jean-Philippe Tetienne (), David A. Broadway, Liam T. Hall, David A. Simpson, Alastair Stacey and Lloyd C. L. Hollenberg
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James D. A. Wood: Centre for Quantum Computation and Communication Technology, School of Physics, The University of Melbourne
Jean-Philippe Tetienne: Centre for Quantum Computation and Communication Technology, School of Physics, The University of Melbourne
David A. Broadway: Centre for Quantum Computation and Communication Technology, School of Physics, The University of Melbourne
Liam T. Hall: School of Physics, The University of Melbourne
David A. Simpson: School of Physics, The University of Melbourne
Alastair Stacey: Centre for Quantum Computation and Communication Technology, School of Physics, The University of Melbourne
Lloyd C. L. Hollenberg: Centre for Quantum Computation and Communication Technology, School of Physics, The University of Melbourne

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract The implementation of nuclear magnetic resonance (NMR) at the nanoscale is a major challenge, as the resolution of conventional methods is limited to mesoscopic scales. Approaches based on quantum spin probes, such as the nitrogen-vacancy (NV) centre in diamond, have achieved nano-NMR under ambient conditions. However, the measurement protocols require application of complex microwave pulse sequences of high precision and relatively high power, placing limitations on the design and scalability of these techniques. Here we demonstrate NMR on a nanoscale organic environment of proton spins using the NV centre while eliminating the need for microwave manipulation of either the NV or the environmental spin states. We also show that the sensitivity of our significantly simplified approach matches that of existing techniques using the NV centre. Removing the requirement for coherent manipulation while maintaining measurement sensitivity represents a significant step towards the development of robust, non-invasive nanoscale NMR probes.

Date: 2017
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DOI: 10.1038/ncomms15950

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