Remote Nanodiamond Magnetometry

TL;DR

This paper demonstrates a novel fibre-based remote magnetometry device using nanodiamonds embedded in tellurite glass fibres, enabling magnetic field detection with simple optical setup and potential biomedical and mining applications.

Contribution

The work introduces a new fibre-based magnetometry technique using embedded nanodiamonds, achieving remote magnetic sensing with straightforward optical methods.

Findings

Achieved a sensitivity of 26 microTesla/√Hz.

Successfully demonstrated remote detection of nitrogen-vacancy defect centers.

Proposed an all-optical sensing technique suitable for remote fibre-based applications.

Abstract

Optical fibres have transformed the way people interact with the world and now permeate many areas of science. Optical fibres are traditionally thought of as insensitive to magnetic fields, however many application areas from mining to biomedicine would benefit from fibre-based remote magnetometry devices. In this work, we realise such a device by embedding nanoscale magnetic sensors into tellurite glass fibres. Remote magnetometry is performed on magnetically active defect centres in nanodiamonds embedded into the glass matrix. Standard optical magnetometry techniques are applied to initialize and detect local magnetic field changes with a measured sensitivity of 26 micron Tesla/square root(Hz). Our approach utilizes straight-forward optical excitation, simple focusing elements, and low power components. We demonstrate remote magnetometry by direct reporting of the magnetic ground states of nitrogen-vacancy defect centres in the optical fibres. In addition, we present and describe theoretically an all-optical technique that is ideally suited to remote fibre-based sensing. The implications of our results broaden the applications of optical fibres, which now have the potential to underpin a new generation of medical magneto-endoscopes and remote mining sensors.