Continuous-Wave Magnetic Field Sensing with Nitrogen-Vacancy Centers in Diamond
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-01-01 |
| Authors | Sepehr Ahmadi |
| Institutions | Technical University of Denmark |
| Citations | 1 |
Abstract
Section titled āAbstractāThe nitrogen-vacancy center, a point defect in diamond, is a promising quantum sensor for magnetic field sensing with high sensitivity and high spatial resolution under ambient conditions. Such a magnetometer has potential applications in various fields, including neuroscience, microelectronics, and nanoscale magnetic resonance microscopy. This thesis presents cavity-enhanced magnetic field sensing using ensembles of nitrogen-vacancy centers in diamond. We apply a phase-sensitive detection method in our experiments and discuss our efforts regarding exploring the ideal modulation conditions. We demonstrate a ā¼ 400 pT/āHz magnetic noise density spanning a bandwidth up to 125 Hz, by measuring the changes in the fluorescence level. Using a five-level model for nitrogen-vacancy centers, a physical model is developed that shows excellent agreement with the measured optically detected magnetic resonance spectra. Furthermore, we introduce an alternative technique for measuring the electron spin-states of nitrogen-vacancy centers based on recording the absorption of the pump light. This method is employed for magnetic field sensing, and a magnetic noise floor of ā¼ 100 nT/āHz is measured spanning a bandwidth up to 125 Hz. We modified the five-level model to describe the absorption detected magnetic resonance of a diamond placed inside an optical cavity. The model agrees very well with experiments.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal Sourceā- DOI: None