Year: 2016
Type: article
Abstract: We propose a new type of sensor, which uses diamond containing the optically active nitrogen-vacancy (NV − ) centres as a laser medium. The magnetometer can be operated at room-temperature and generates light that can be readily fibre coupled, thereby permitting use in industrial applications and remote sensing. By combining laser pumping with a radio-frequency Rabi-drive field, an external magnetic field changes the fluorescence of the NV − centres. We use this change in fluorescence level to push the laser above threshold, turning it on with an intensity controlled by the external magnetic field, which provides a coherent amplification of the readout signal with very high contrast. This mechanism is qualitatively different from conventional NV − –based magnetometers which use fluorescence measurements, based on incoherent photon emission. We term our approach laser threshold magnetometer (LTM). We predict that an NV − –based LTM with a volume of 1 mm 3 can achieve shot-noise limited dc sensitivity of 1.86 fT and ac sensitivity of 3.97 fT .
Source: New Journal of Physics
Authors: Jan Jeske, Jared H Cole, Andrew D Greentree
Institutions: RMIT University, ARC Centre for Nanoscale BioPhotonics
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,610
Funder: Australian Research Council
OpenAlex ID: W2231470254