Diffractive microoptics in porous silicon oxide by grayscale lithography

Area of Science:

• Materials Science
• Optical Engineering
• Nanotechnology

Background:

• Traditional microoptic fabrication often requires complex support structures.
• Two-photon polymerization (TPP) is a common microfabrication technique.
• Existing TPP methods can have limitations in shape accuracy and throughput.

Purpose of the Study:

• To demonstrate focusing and imaging capabilities of microoptics fabricated using TPP grayscale lithography (2GL).
• To integrate these microoptics into a porous silicon oxide (SiO2) substrate.
• To evaluate the performance benefits of this novel fabrication approach.

Main Methods:

• Microoptics were manufactured using two-photon polymerization grayscale lithography (2GL).
• Optics were 3D printed directly into porous silicon oxide (SiO2) structures.
• Singlet and doublet diffractive lenses were fabricated and characterized.

Main Results:

• 2GL improved shape accuracy and throughput compared to standard TPP.
• Diffractive lenses with numerical apertures up to 0.6 were successfully fabricated.
• A doublet lens system achieved a resolution of 287 line pairs per millimeter (lp/mm).

Conclusions:

• 3D printing microoptics in porous SiO2 offers a fabrication-efficient approach.
• The integrated optics eliminate the need for external support structures.
• This technique shows significant potential for advanced and unconventional microoptical solutions.