Precise Three-Dimensional Scan-Free Multiple-Particle Tracking over Large Axial Ranges with Tetrapod Point Spread...

Area of Science:

• Biophysics
• Optical Microscopy
• Nanotechnology

Background:

• Accurate 3D localization of nanoscale emitters is crucial for understanding biological processes.
• Existing microscopy techniques face limitations in axial range and precision for thick samples.

Purpose of the Study:

• To design novel point spread functions (PSFs) for information-optimal microscopy.
• To achieve high-precision 3D localization of nanoscale emitters over extended axial ranges.

Main Methods:

• Development of a novel framework for information-optimal microscopy.
• Design and implementation of Tetrapod point spread functions (PSFs).
• Utilizing a high numerical aperture objective lens for enhanced imaging.

Main Results:

• Tetrapod PSFs enable high-precision 3D localization of nanoscale emitters.
• Customizable axial (z) imaging ranges of up to 20 μm are achievable.
• Demonstrated flow profiling in microfluidic channels and scan-free tracking of quantum-dot-labeled molecules on living cells.

Conclusions:

• Tetrapod PSFs represent a significant advancement in 3D super-resolution microscopy.
• The technique offers unprecedented capabilities for imaging thick biological samples with high precision.
• Opens new avenues for studying molecular dynamics in living cells.