Mass-producible micro-optical elements by injection compression molding and focused ion beam structured titanium...

Area of Science:

• Optics and Photonics
• Materials Science
• Manufacturing Engineering

Background:

• Micro-optical elements are crucial for compact devices.
• Traditional fabrication methods for micro-optics can be slow and expensive for mass production.
• Diffractive Fresnel lenses offer advantages in miniaturization and optical performance.

Purpose of the Study:

• To demonstrate a scalable fabrication process for polymer-based micro Fresnel lenses.
• To achieve high optical performance and shape accuracy in mass-produced lenses.
• To validate the suitability of the fabricated lenses for various applications.

Main Methods:

• Utilizing injection compression molding for polymer lens fabrication.
• Employing focused ion beam milling for high-precision structuring of titanium molding tools.
• Implementing iterative design optimization for enhanced mold accuracy.
• Transferring inverse Fresnel lens patterns from titanium molds to polymer substrates.

Main Results:

• Successfully fabricated polymer-based micro Fresnel lenses with high precision.
• Demonstrated mass production compatibility of the injection compression molding technique.
• Validated that the optical performance of molded lenses aligns well with simulation predictions.
• Confirmed the robustness and suitability of the titanium molding tool.

Conclusions:

• The developed injection compression molding process is effective for mass-producing high-quality polymer micro Fresnel lenses.
• Focused ion beam milling and iterative design optimization enable precise mold fabrication.
• This method offers a viable solution for applications demanding large quantities of compact optical elements.