Room Temperature Operation of a Radiofrequency Diamond Magnetometer near the Shot Noise Limit

TL;DR

This paper demonstrates a nitrogen vacancy diamond magnetometer operating at room temperature with a detection bandwidth of 1.6 MHz and near shot noise sensitivity, advancing practical magnetic sensing technologies.

Contribution

It introduces an analytical model for NV- ensemble response and achieves near shot noise limit sensitivity at ambient conditions.

Findings

Detection bandwidth of 1.6 MHz achieved.

Sensitivity of 4.6 nT/Hz^{1/2} near shot noise limit.

Operates effectively at room temperature.

Abstract

We operate a nitrogen vacancy (NV-) diamond magnetometer at ambient temperatures and study the dependence of its bandwidth on experimental parameters including optical and microwave excitation powers. We introduce an analytical theory that yields an explicit formula for the response of an ensemble of NV- spins to an oscillating magnetic field, such as in NMR applications. We measure a detection bandwidth of 1.6 MHz and a sensitivity of 4.6 nT/Hz^(1/2), unprecedented in a detector with this active volume and close to the photon shot noise limit of our experiment.