Grayscale Digital Light Processing 3D Printed Microlens for Scale-Down Self-Focusing Printing.

Area of Science:

• Micro/nano fabrication
• Additive manufacturing
• Optical engineering

Background:

• Existing 3D printing technologies face limitations in precision and efficiency for microstructures.
• Fabricating composite 3D microstructures with high accuracy remains a challenge.

Purpose of the Study:

• To develop a novel microlens self-focusing printing technique for high-precision microfabrication.
• To overcome the limitations of current 3D printing methods in producing complex microstructures.

Main Methods:

• Integration of digital light processing (DLP) 3D printing with an optical microscope platform.
• Utilizing controlled image grayscale for millisecond-level single-exposure microlens fabrication.
• Leveraging the self-focusing property of microlenses for sub-4µm pattern printing.

Main Results:

• Microlenses with precise optical focusing capabilities were fabricated.
• Achieved pattern printing with feature sizes below 4 µm without additional hardware.
• Successfully fabricated composite tetrahedral magnetic microrobots with controlled dynamic motion.

Conclusions:

• The proposed microlens self-focusing printing technique offers a simple and versatile approach for high-precision microstructure fabrication.
• This method enhances process efficiency and precision in micro/nano fabrication.
• Demonstrated potential for integrated fabrication of functional composite microstructures.