Ultralow Laser Power Three-Dimensional Superresolution Microscopy Based on Digitally Enhanced STED

Area of Science:

• Biophysics
• Microscopy
• Cell Biology

Background:

• Optical microscopes face resolution limits due to optical diffraction, particularly in axial resolution, hindering 3D cellular structure visualization.
• Stimulated emission depletion (STED) superresolution microscopy overcomes diffraction limits for 3D imaging but traditionally requires high laser power, risking sample damage.

Purpose of the Study:

• To develop an ultralow laser power 3D STED superresolution imaging method.
• To enable high-resolution 3D imaging with reduced photodamage to biological samples and probes.

Main Methods:

• Implementation of an innovative ultralow laser power 3D STED superresolution imaging technique.
• Acquisition of 3D superresolution images using significantly reduced depletion laser power.

Main Results:

• Achieved lateral resolution of 71 nm and axial resolution of 144 nm in fixed cells.
• Utilized only 0.65 mW of depletion laser power, demonstrating the efficacy of the ultralow power approach.

Conclusions:

• The developed ultralow laser power 3D STED method significantly enhances 3D superresolution imaging capabilities.
• This method holds substantial promise for future 3D superresolution imaging applications in living cells due to its low photodamage profile.