Dr. Jean-Michel Le Floch Profile

Dr. Jean-Michel Le Floch

Research Assistant Professor at Univ of Western Australia

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Proceedings Article | 7 December 2013 Paper

Non-intrusive tunable resonant microwave cavity for optical detected magnetic resonance of NV centres in nanodiamonds

Jean-Michel Le Floch, Carlo Bradac, Thomas Volz, Michael Tobar, Stefania Castelletto

Proceedings Volume 8923, 89233P (2013) https://doi.org/10.1117/12.2035861

KEYWORDS: Microwave radiation, Resonators, Magnetism, Luminescence, Diamond, Magnetic sensors, Dielectrics, Antennas, Electromagnetism, Interferometers

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Optically detected magnetic resonance (ODMR) in nanodiamond nitrogen-vacancy (NV) centres is usually achieved by applying a microwave field delivered by micron-size wires, strips or antennas directly positioned in very close proximity (~ μm) of the nanodiamond crystals. The microwave field couples evanescently with the ground state spin transition of the NV centre (2.87 GHz at zero magnetic field), which results in a reduction of the centre photoluminescence. We propose an alternative approach based on the construction of a dielectric resonator. We show that such a resonator allows for the efficient detection of NV spins in nanodiamonds without the constraints associated to the laborious positioning of the microwave antenna next to the nanodiamonds, providing therefore improved flexibility. The resonator is based on a tunable Transverse Electric Mode in a dielectric-loaded cavity, and we demonstrate that the resonator can detect single NV centre spins in nanodiamonds using less microwave power than alternative techniques in a non-intrusive manner. This method can achieve higher precision measurement of ODMR of paramagnetic defects spin transition in the micro to millimetre-wave frequency domain. Our approach would permit the tracking of NV centres in biological solutions rather than simply on the surface, which is desirable in light of the recently proposed applications of using nanodiamonds containing NV centres for spin labelling in biological systems with single spin and single particle resolution.

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