Optical Tweezers Assembled Nanodiamond Quantum Sensors

Area of Science:

• Nanotechnology
• Quantum Sensing
• Optics

Background:

• Nanodiamonds with nitrogen-vacancy (NV-) defect centers are promising for quantum sensing.
• Achieving precise control over nanodiamond positioning and orientation is challenging for applications.

Purpose of the Study:

• To demonstrate the use of gradient force optical tweezers for self-assembling nanodiamonds into functional superstructures.
• To evaluate the performance of these superstructures as nanoscale quantum probes for magnetic resonance sensing.

Main Methods:

• Utilizing gradient force optical tweezers to mediate the self-assembly of nanodiamonds.
• Employing confocal imaging to isolate signals from individual nanodiamonds within superstructures.
• Measuring optically detected magnetic resonance (ODMR) contrast and its dynamic changes.

Main Results:

• Successfully assembled nanodiamonds into superstructures with enhanced positioning accuracy and orientation control.
• Demonstrated superior magnetic resonance sensing capabilities of the nanodiamond assemblies.
• Confirmed that confocal imaging preserves the single-crystal probe properties within the assembly.

Conclusions:

• Nanodiamond superstructures assembled via optical tweezers offer enhanced quantum probe performance.
• This approach enables real-time monitoring of dynamic changes in magnetic resonance sensing.
• The technique holds potential for advanced nanoscale sensing applications.