Turning a normal microscope into a super-resolution instrument using a scanning microlens array.

Area of Science:

• Optical Microscopy
• Nanotechnology
• Materials Science

Background:

• Dielectric microspheres can achieve optical super-resolution microscopy by generating virtual images beyond the diffraction limit.
• A key limitation of microsphere-based super-resolution microscopy is the restricted field-of-view, confined to the central image area.
• Existing methods struggle to expand the imaging area while maintaining super-resolution capabilities.

Purpose of the Study:

• To overcome the field-of-view limitation in dielectric microsphere-based optical super-resolution microscopy.
• To develop a method for stitching multiple super-resolved images into a larger mosaic.
• To demonstrate a practical and potentially affordable super-resolution imaging technique.

Main Methods:

• Utilized a micro-fabricated array of ordered dielectric microspheres (barium titanate glass).
• Employed a customized algorithm and a motorized stage for precise scanning of the microsphere array over the sample.
• Acquired images at each step and stitched the central super-resolution virtual images into a mosaic.

Main Results:

• Achieved a lateral resolution of 130 nm (~λ/4).
• Successfully scanned a large surface area of 5 × 10^5 µm^2.
• Demonstrated the feasibility of creating a mosaic image from stitched super-resolution virtual images.

Conclusions:

• The developed scanning microsphere array technique effectively expands the field-of-view for optical super-resolution microscopy.
• This approach offers a pathway towards more widespread adoption of affordable super-resolution imaging.
• The findings lay the groundwork for diverse applications requiring high-resolution, large-area imaging.