Note: real time three-dimensional topography measurement of microfluidic devices with pillar structures using...

Area of Science:

• Microfluidics
• Optical Metrology
• Surface Characterization

Background:

• Microfluidic devices often incorporate miniature pillars for filtration.
• Accurate 3D topography measurement of these pillars is crucial for device performance.
• Existing methods like non-confocal profilometry and standard confocal microscopy have limitations in speed and applicability to transparent devices.

Purpose of the Study:

• To develop a rapid and accurate technique for measuring the 3D topography of miniature pillars in microfluidic devices.
• To overcome the limitations of current measurement methods for transparent microfluidic structures.

Main Methods:

• Modification of a confocal microscope by integrating a spinning Nipkow disk.
• Application of chromatic confocal technique for 3D topography acquisition.
• Development of a single-image measurement protocol.

Main Results:

• The proposed technique successfully measured the 3D topography of pillar structures in a microfluidic device.
• The method demonstrated feasibility for real-time, in-situ measurement.
• A single confocal image is sufficient for complete measurement, significantly reducing acquisition time.

Conclusions:

• The developed modified confocal microscopy technique offers a fast and efficient solution for 3D topography measurement of microfluidic pillars.
• This technique is suitable for in-situ, real-time monitoring during microfluidic device production.
• It addresses the challenges posed by transparent microfluidic structures and the time-consuming nature of traditional scanning methods.