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Lateral flow through a parallel gap driven by surface hydrophilicity and liquid edge pinning for creating microlens

Chengbao Jiang1, Xiangming Li, Hongmiao Tian

  • 1Micro-/Nano-technology Research Center State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University , 28 West Xianning Road, Xi'an, Shaanxi 710049, China.

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Summary

This study presents a cost-effective method for making polymer microlens arrays (MLAs) with adjustable curvatures. The process uses surface energy to control the shape of UV-cured polymer lenses, enabling precise optical applications.

Keywords:
hydrophilicityliquid pinningmicrolens arraymicromoldingsurface energy

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Area of Science:

  • Materials Science
  • Optics
  • Polymer Science

Background:

  • Microlens arrays (MLAs) are crucial optical components.
  • Existing fabrication methods can be complex and costly.
  • Controlling microlens curvature is essential for optical performance.

Purpose of the Study:

  • To propose an economical and controllable method for fabricating polymer microlens arrays.
  • To investigate the use of surface energy in controlling microlens curvature.
  • To demonstrate a UV-curing process for solid MLA formation.

Main Methods:

  • A surface-energy driven process utilizing UV-curable prepolymers.
  • Employing a cell with microholes in a top template and a flat substrate.
  • Controlling interface curvature via edge pinning and UV radiation.
  • Adjusting material interface free energy or gap height to tune curvature.

Main Results:

  • Formation of a polymer microlens array with controllable curvatures.
  • Demonstration of economic viability for MLA production.
  • Successful UV-curing of prepolymer into solid microlenses.
  • Tunable lens curvature achieved through material selection and mechanical adjustments.

Conclusions:

  • The proposed surface-energy driven method offers an economical route to polymer microlens arrays.
  • Precise control over microlens curvature is achievable.
  • This technique holds promise for scalable and cost-effective optical component manufacturing.