Three-dimensional nano-localization of single fluorescent emitters

Area of Science:

• Nanotechnology
• Microscopy
• Materials Science

Background:

• Accurate 3D localization of nano-emitters is essential for understanding nanomaterial dynamics.
• Existing super-resolution techniques face limitations in axial range and precision.

Purpose of the Study:

• To introduce a novel 3D localization method combining self-interference and lateral super-resolution microscopy.
• To achieve nanometer-level precision for single nano-emitters in all three dimensions.

Main Methods:

• Integration of self-interference microscopy with lateral super-resolution microscopy.
• Localization of single quantum dots on polymer bilayers undergoing environmental changes.

Main Results:

• Demonstrated nanometer-scale displacement tracking of quantum dots.
• Achieved localization precision with standard deviations below 10 nm for both axial and lateral positions.
• Successfully observed swelling-induced polymer bilayer changes impacting quantum dot positions.

Conclusions:

• The novel microscopy approach enables high-precision 3D tracking of nano-emitters over large axial ranges.
• This technique is valuable for studying dynamic processes in soft materials and nanodevices.
• The method provides a significant advancement in nanoscale metrology.