Scanning Miniaturized Magnetometer Based on Diamond Quantum Sensors and Its Potential Application for Hidden Target...

Area of Science:

• Quantum Sensing
• Materials Science
• Magnetometry

Background:

• Diamond nitrogen-vacancy (NV) centers are promising quantum defects for sensitive magnetic field detection.
• Miniaturized sensors are crucial for portable and in-situ magnetic imaging applications.
• Current magnetic imaging techniques face limitations in resolution and portability.

Purpose of the Study:

• To develop a miniaturized magnetic sensor for high-resolution magnetic imaging.
• To demonstrate the capability of NV-based magnetometry for detecting hidden magnetic objects.
• To investigate factors influencing magnetic image quality and propose compensation methods.

Main Methods:

• Fabrication of a miniaturized magnetic sensor utilizing diamond nitrogen-vacancy (NV) centers.
• Implementation of a two-dimensional scanning setup for sample imaging.
• Application of lock-in detection to track NV spin resonance changes induced by magnetic fields.
• Magnetic simulations to validate experimental results.
• Development of NV vector magnetometry for tilt angle compensation.

Main Results:

• Achieved millimeter-scale resolution magnetic imaging of samples.
• Demonstrated proof-of-principle magnetic imaging using a diorama with hidden magnets.
• Identified image distortions influenced by lock-in detection frequency and magnetic field strength.
• Observed good agreement between experimental and simulated magnetic images.
• Proposed a vector magnetometry method for accurate object localization.

Conclusions:

• A novel scanning miniaturized magnetometer based on diamond NV centers has been developed for magnetic imaging.
• The sensor shows potential for detecting concealed magnetic objects in various scenarios.
• Image quality can be optimized by careful selection of detection parameters.
• NV vector magnetometry offers a pathway for accurate localization of tilted magnetic targets.