Three-dimensional nanoscale localization of point-like objects using self-interference digital holography.

Area of Science:

• Microscopy and Imaging
• Optical Physics
• Nanotechnology

Background:

• Accurate 3D localization of fluorescent emitters is crucial for nanoscale imaging.
• Conventional microscopy often requires refocusing for large axial range imaging.
• Existing single molecule localization techniques offer high resolution but can be limited by axial range.

Purpose of the Study:

• To introduce and validate a novel 3D localization method for point-like fluorescent emitters.
• To demonstrate nanometer precision localization over large volumes using self-interference digital holography (SIDH).
• To assess the performance of SIDH with varying photon detection counts.

Main Methods:

• Utilizing self-interference digital holography (SIDH) for 3D imaging.
• Applying single molecule localization principles to SIDH data.
• Imaging fluorescent nanospheres (100 nm and 40 nm) to validate the technique.

Main Results:

• Achieved 3D localization of fluorescent nanospheres with nanometer precision.
• Demonstrated a lateral localization precision of 5 nm and axial precision of 40 nm with 49,000 detected photons.
• Successfully detected nanospheres using as few as 13,000 detected photons, showcasing sensitivity.

Conclusions:

• SIDH is a powerful technique for high-precision 3D localization of fluorescent emitters in large volumes.
• The method overcomes the need for refocusing, simplifying imaging over extended axial ranges.
• SIDH offers a promising approach for advanced microscopy applications requiring nanoscale resolution.