Low-Field, All-optical, Microwave-free NV-Diamond Magnetometer

Sensitive nitrogen-vacancy (NV) magnetometry typically utilizes microwave sources to selectively manipulate the sensor's spin state under a bias field. However, this external bias field and microwave signals may perturb the sample of interest or be incompatible with operational conditions. In this poster, we present an all-optical, microwave-free NV-diamond magnetometer that operates at low magnetic fields (<20 G) and discuss the relevant physics behind this all-optical modality. Our findings open up new possibilities for utilizing NV sensors in a wider range of applications.