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Fiber-coupled Diamond Magnetometry with an Unshielded 30 pT/$\sqrt{\textrm{Hz}}$ Sensitivity
- Source :
- Physical Review Applied 19, 044042 (2023)
- Publication Year :
- 2022
-
Abstract
- Ensembles of nitrogen vacancy centres (NVCs) in diamond can be employed for sensitive magnetometry. In this work we present a fiber-coupled NVC magnetometer with an unshielded sensitivity of (30 $\pm$ 10) pT/$\sqrt{\textrm{Hz}}$ in a (10 - 500)-Hz frequency range. This sensitivity is enabled by a relatively high green-to-red photon conversion efficiency, the use of a [100] bias field alignment, microwave and lock-in amplifier (LIA) parameter optimisation, as well as a balanced hyperfine excitation scheme. Furthermore, a silicon carbide (SiC) heat spreader is used for microwave delivery, alongside low-strain $^{12}\textrm{C}$ diamonds, one of which is placed in a second magnetically insensitive fluorescence collecting sensor head for common-mode noise cancellation. The magnetometer is capable of detecting signals from sources such as a vacuum pump up to 2 m away, with some orientation dependence but no complete dead zones, demonstrating its potential for use in remote sensing applications.<br />Comment: 21 pages, 19 figures, correction to data analysis
Details
- Database :
- arXiv
- Journal :
- Physical Review Applied 19, 044042 (2023)
- Publication Type :
- Report
- Accession number :
- edsarx.2211.09170
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevApplied.19.044042