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Diffractive microoptics in porous silicon oxide by grayscale lithography

Optics Express +

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June 14, 2025

|

June 14, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

We developed 3D printed diffractive microoptics using two-photon polymerization grayscale lithography (2GL) in porous silicon oxide. This novel method enhances fabrication efficiency and optical performance for advanced micro-devices.

Area Of Science

  • Optics and Photonics
  • Materials Science
  • Additive Manufacturing

Background

  • Traditional microoptic fabrication often requires complex support structures, increasing time and limiting design.
  • Two-photon polymerization (TPP) is a common microfabrication technique, but can be limited in speed and accuracy.
  • Porous materials offer unique integration possibilities for micro-optics.

Purpose Of The Study

  • To demonstrate focusing and imaging capabilities of diffractive microoptics fabricated using 2GL within porous silicon oxide.
  • To showcase the advantages of 2GL over standard TPP, including improved shape accuracy and throughput.
  • To present a novel fabrication approach that integrates microoptics directly into a supporting porous matrix.

Main Methods

  • Diffractive microoptics were fabricated using two-photon polymerization grayscale lithography (2GL) within a porous silicon oxide (SiO2) matrix.
  • Singlet diffractive lenses (500 µm diameter, NA up to 0.6) were created and characterized by measuring focal plane and optical axis intensity distributions.
  • A doublet lens system (600 µm diameter, <60 µm thickness) was designed, fabricated, and tested for imaging performance using a USAF 1951 resolution test chart.

Main Results

  • The 2GL process enabled high shape accuracy and increased fabrication throughput compared to standard TPP.
  • Singlet lenses demonstrated effective focusing capabilities.
  • The doublet lens system achieved a resolution of 287 line pairs per millimeter (lp/mm), validating its imaging performance.

Conclusions

  • 3D printing diffractive microoptics into porous SiO2 using 2GL offers a promising, integrated solution.
  • This technique reduces fabrication time, design constraints, and increases the optically active area.
  • The method holds potential for creating complex and unconventional microoptical systems.