Concepts for structured illumination microscopy with extended axial resolution through mirrored illumination

Area of Science:

• Microscopy
• Optical Imaging
• Super-resolution Microscopy

Background:

• Wide-field fluorescence microscopy offers speed but lacks optical sectioning and axial resolution.
• 3D structured illumination microscopy (SIM) improves resolution but axial performance remains suboptimal.
• Interferometric methods (4Pi, I5M) achieve high axial resolution but require complex setups.

Purpose of the Study:

• To theoretically and numerically investigate a simpler dual-objective scheme for enhanced 3D-SIM.
• To provide a method easily integrated into existing 3D-SIM microscopes.
• To achieve superior lateral and axial resolutions without interferometric detection.

Main Methods:

• Theoretical and numerical investigation of a dual-objective microscopy scheme.
• Proposed integration with existing 3D-SIM systems.
• Utilized conventional fluorophores for imaging.

Main Results:

• Demonstrated a simpler dual-objective approach for 3D-SIM.
• Achieved lateral and axial resolutions exceeding 125 nm.
• The proposed method avoids the complexity of interferometric detection.

Conclusions:

• The proposed dual-objective scheme offers a straightforward upgrade for 3D-SIM.
• This method significantly enhances both lateral and axial resolution.
• It presents a practical solution for advanced super-resolution imaging.