Conical diffraction illumination opens the way for low phototoxicity super-resolution imaging

Area of Science:

• Biophysics
• Optical Microscopy
• Biotechnology

Background:

• Super-resolution microscopy enables imaging beyond the diffraction limit.
• Existing techniques often require specific sample preparations or high light doses.
• Live-cell imaging and long-term studies are limited by phototoxicity and sample stability.

Purpose of the Study:

• To introduce a novel super-resolution fluorescence imaging modality based on conical diffraction.
• To demonstrate the capabilities of biaxial super-resolution (BSR) for biological imaging.
• To highlight BSR's advantages for live-cell and long-term imaging applications.

Main Methods:

• Utilized conical diffraction through a biaxial crystal to generate compact illumination patterns.
• Implemented the BSR modality on a commercial confocal microscope.
• Acquired and analyzed super-resolved images of biological specimens.

Main Results:

• Achieved super-resolution imaging with significantly lower light illumination than confocal microscopy.
• Demonstrated BSR's compatibility with any objective lens, irrespective of its specifications.
• Acquired high-quality super-resolved images of biological objects, including long-term live-cell imaging.
• Confirmed that the light dose for BSR is below phototoxicity thresholds.

Conclusions:

• Biaxial super-resolution (BSR) is a versatile and efficient super-resolution imaging technology.
• BSR overcomes key limitations of existing modalities, particularly for live-cell and extended imaging.
• The technology shows broad applicability and potential for advancing biological research.