Widefield and total internal reflection fluorescent structured illumination microscopy with scanning galvo mirrors

Area of Science:

• Biophysics
• Optical Microscopy
• Live Cell Imaging

Background:

• Structured Illumination Microscopy (SIM) enables super-resolution imaging but often faces limitations in speed and flexibility for live cell applications.
• Existing SIM systems may require complex setups or lack adaptability for different imaging modes or sample depths.

Purpose of the Study:

• To develop an alternative, flexible, and high-resolution structured illumination microscopy (SIM) system.
• To enable fast and adaptable live cell imaging with improved resolution.

Main Methods:

• The prototype employs scanning galvo mirrors, a polarization converter, and a piezo-platform to generate dynamic illumination patterns.
• Arbitrary control over illumination pattern period and orientation is achieved by adjusting galvanometer angles.
• The system allows seamless switching between widefield and total internal reflection fluorescent-SIM modes.

Main Results:

• A twofold resolution improvement was experimentally demonstrated.
• The system offers enhanced flexibility in pattern period and illumination orientation compared to previous SIM systems.
• The prototype is capable of fast, shifted, s-polarization interfered, and periodic variable illumination patterns.

Conclusions:

• The developed SIM prototype provides a flexible and high-performance solution for live cell super-resolution microscopy.
• The adaptable illumination control enhances its utility for various imaging depths and modes.
• This approach advances the capabilities of SIM for demanding biological imaging applications.