A high-sensitivity fiber-coupled diamond magnetometer with surface coating

TL;DR

This paper introduces a fiber-coupled diamond magnetometer with surface coating that achieves high sensitivity and broad bandwidth, suitable for practical physical, chemical, and biological applications.

Contribution

The study demonstrates a novel surface coating technique on diamond to enhance fluorescence collection and excitation, improving magnetometer sensitivity and bandwidth.

Findings

Magnetic field sensitivity of 35 pT/√Hz achieved.

Bandwidth of 4.1 KHz demonstrated.

Successful magnetic field mapping of copper-wire mesh.

Abstract

Nitrogen-vacancy quantum defects in diamond offer a promising platform for magnetometry because of their remarkable optical and spin properties. In this Letter, we present a high-sensitivity and wide-bandwidth fiber-based quantum magnetometer for practical applications. By coating the diamond surface with silver reflective film, both the fluorescence collection and excitation efficiency are enhanced. Additionally, tracking pulsed optically detected magnetic resonance spectrum allowed a magnetic field sensitivity of $35$ pT$/\sqrt{\rm{Hz}}$ and a bandwidth of $4.1$ KHz. Finally, this magnetometer was successfully applied to map the magnetic field induced by the current-carrying copper-wire mesh. Such a stable and compact magnetometry can provide a powerful tool in many areas of physical, chemical, and biological researches.