Ultra-smooth micro-optical components of various geometries

Area of Science:

• Materials Science
• Optical Engineering
• Nanotechnology

Background:

• Fabricating micro-optical components on non-planar substrates with high precision is challenging.
• Existing methods often struggle with achieving ultra-smooth surfaces on hard materials.

Purpose of the Study:

• To develop a novel fabrication technology for ultra-smooth 3D micro-optical components on non-planar substrates.
• To demonstrate the capability of this technology on hard materials like sapphire.

Main Methods:

• Utilizing femtosecond laser multi-photon polymerization for high-resolution patterning.
• Integrating dry etching to enhance surface smoothness and profile control.
• Applying the technique in-situ on non-planar surfaces.

Main Results:

• Achieved micro-optical components with an ultra-smooth 3D continuous profile.
• Demonstrated surface roughness of approximately 1.5 nm on hard materials.
• Successfully fabricated various high-quality micro-optical components on sapphire.

Conclusions:

• Dry-etching-assisted femtosecond laser lithography is a versatile technique for fabricating arbitrary ultra-smooth micro/nanostructures.
• This method shows significant potential for advanced optical applications on non-planar hard materials.