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Mask-Moving-Lithography-Based High-Precision Surface Fabrication Method for Microlens Arrays.

Jianwen Gong1,2,3, Ji Zhou1,3, Junbo Liu1,3

  • 1Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China.

Micromachines
|February 24, 2024
PubMed
Summary
This summary is machine-generated.

A new fabrication method for microlens arrays significantly reduces surface errors and roughness. This high-precision technique improves optical performance by minimizing shape deviations and achieving nanometer-level surface smoothness.

Keywords:
inverted air bath reflux methodmicrolens arrayspre-exposure technology

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Microfabrication Technologies

Background:

  • Microlens arrays are crucial micro-optical elements for enhancing optical system integration and performance.
  • Surface shape errors and roughness are key determinants of microlens array optical characteristics and overall performance.

Purpose of the Study:

  • To propose and validate a high-precision surface fabrication method for microlens arrays.
  • To reduce surface shape errors and surface roughness in microlens arrays.
  • To improve the fabrication precision of microlens arrays for advanced optical applications.

Main Methods:

  • Utilized mask-moving-projection-lithography for precise surface fabrication.
  • Employed pre-exposure technology to lower photoresist development threshold, mitigating exposure impact on surface shape.
  • Applied an inverted air bath reflux method post-development to eliminate surface protrusions by achieving a molten state.

Main Results:

  • Fabricated microlens arrays exhibited a root mean square error below 2.8%.
  • Achieved surface roughness at the nanometer level, indicating superior surface quality.
  • Demonstrated significant improvement in the fabrication precision of microlens arrays.

Conclusions:

  • The proposed mask-moving-projection-lithography method effectively enhances microlens array precision.
  • The combination of pre-exposure and inverted air bath reflux successfully minimizes surface defects.
  • This advanced fabrication technique offers a pathway to higher-performance micro-optical systems.