Optical Magnetometry Based on Nanodiamonds with Nitrogen-Vacancy Color Centers

Area of Science:

• Quantum sensing
• Materials science
• Nanotechnology

Background:

• Nitrogen-vacancy (NV) color centers in diamond are highly promising for sensing.
• Applications include magnetometry and thermometry.

Purpose of the Study:

• Investigate nanodiamonds deposited on glass substrates for sensing.
• Develop a method for magnetic field tracking using NV center spectra.
• Demonstrate remote sensing capabilities.

Main Methods:

• Deposition of nanodiamonds from suspension onto glass substrates.
• Recording fluorescence and optically detected magnetic resonance (ODMR) spectra.
• Utilizing continuous poly-crystalline spectra for magnetic field tracking.
• Employing high-numerical-aperture imaging fiber bundles for remote sensing.

Main Results:

• Successfully deposited and characterized nanodiamond ensembles.
• Presented fluorescence and ODMR spectra of nanodiamonds.
• Introduced a scheme for magnetic field tracking.
• Demonstrated remote sensing using a fiber optic bundle with nanodiamonds.

Conclusions:

• Nanodiamonds with NV centers are suitable for magnetic field sensing.
• The developed scheme enables tracking of magnetic field values.
• Remote sensing applications are feasible using this approach.