Transmission structured illumination microscopy with tunable frequency illumination using tilt mirror assembly.

Area of Science:

• Microscopy
• Optical Imaging
• Biophysics

Background:

• Standard structured illumination microscopy (SIM) offers super-resolution but often compromises field-of-view (FOV).
• Achieving isotropic super-resolution across a large FOV remains a challenge in advanced microscopy techniques.

Purpose of the Study:

• To demonstrate a novel tilt-mirror assisted transmission structured illumination microscopy (tSIM) system.
• To achieve large field-of-view super-resolution imaging with improved resolution beyond the diffraction limit.

Main Methods:

• Utilized custom-designed tilt-mirrors to generate tunable frequency structured illumination patterns.
• Employed a low numerical aperture (NA) objective lens for detection to maximize FOV.
• Experimentally validated the system using fluorescent beads and biological samples.

Main Results:

• Demonstrated a single field-of-view image of 0.56 mm x 0.35 mm.
• Achieved 1.7- to 2.4-fold resolution improvement over the diffraction limit.
• Showcased decoupling of illumination and collection paths for objective lens flexibility.

Conclusions:

• tSIM enables large FOV super-resolution imaging by decoupling illumination and collection optics.
• The scalable FOV of tSIM is suitable for applications requiring large area scanning, such as pathology.
• This technique facilitates correlated spatial and temporal imaging for diverse biological studies.