Dynamic 3D profiling of microscale surface using a MEMS mirror laser differential confocal microscope

Area of Science:

• Optics and Photonics
• Materials Science
• Microscopy

Background:

• Existing 3D micro-surface profiling techniques struggle with real-time imaging of dynamic samples at high resolution.
• Profiling rapidly changing or moving surfaces at nanoscale 3D spatial resolution is a significant challenge.

Purpose of the Study:

• To demonstrate a high-speed MEMS mirror-based laser differential confocal microscope for dynamic 3D micro-surface profiling.
• To overcome the limitations of current methods in imaging dynamic surfaces with high resolution.

Main Methods:

• Utilized a MEMS mirror for 2D scanning (1200x650 pixels, 140x90 μm FOV) at 80 frames per second.
• Employed laser differential confocal detection for high-resolution profiling.
• Implemented objective-space telecentric laser projection for uniform axial response.

Main Results:

• Achieved 25 nm axial resolution.
• Enabled real-time 3D micro/nano scale profiling of dynamic surfaces at 80 frames per second.
• Eliminated the need for motion stages, significantly increasing imaging throughput.

Conclusions:

• The developed system provides unprecedented real-time 3D profiling of dynamic microscale surfaces at nanometer-level axial resolutions.
• Offers new insights for process development and quality control in precision micro/nano fabrication.
• Represents a breakthrough in imaging throughput for dynamic surface analysis.