Enhanced-resolution line-scan confocal microscopy via parallel pixel reassignment

Area of Science:

• Optical Microscopy
• Nanotechnology
• Image Processing

Background:

• Confocal microscopy faces a resolution-speed tradeoff.
• Digital micromirror devices (DMDs) offer advanced illumination control.

Purpose of the Study:

• To enhance resolution and imaging speed in confocal microscopy.
• To develop a method for artifact-free isotropic resolution enhancement.
• To improve micro-nano structure topography inspection efficiency.

Main Methods:

• Orthogonal Multi-Line Pixel Reassignment (OML-PR) using a DMD.
• High-density orthogonal multi-line-structured illumination for parallel lateral scanning.
• 3D coordinated continuous axial scanning.
• Gradient-guided reassignment mechanism for artifact-free resolution enhancement.

Main Results:

• Achieved 137 nm lateral resolution with a 100×/0.90 NA objective at 455 nm wavelength.
• Successfully detected 98 nm gap defects and 48 nm bridge defects.
• Completed full 3D scans in under 3 seconds.

Conclusions:

• OML-PR method significantly enhances acquisition efficiency and resolution in confocal microscopy.
• The technique enables high-quality reconstruction and efficient inspection of micro-nano structures.
• Demonstrates a viable approach to overcome the resolution-speed limitations in advanced imaging.